NEET UG Chemistry P Block Elements MCQs

 Important Points

The elements (except He atom) having outermost valence shell electronic configuration ns² np¹ to ns² np⁶ are called p-block elements. Since p-orbital can accommodate six maximum electrons, six groups 13 to 18 are there in p-block elements. We shall study group 13 and 14 i.e. Boron and carbon group elements in this unit. Generally in a row or period eletrongativity, ionisation enthalpy and oxidising power are increasing as the atomic number increases while in group it decreases as the atomic number increases. Generally, in group covalent radius, van der Waals radius and metallic character increases as the atomic number increases. It is a characteristic of the p-block elements that metal, non-metal and metalloid are included in the same group.

The group 13 includes elements, Boron, Aluminium, Gallium, Indium and Thalium. Aluminium is the third most abundant element found in earth's crust. The important ores of aluminium are bauxite and cryolite. Variation in some properties of group 13 elements are like atomic radii and ionic radii, ionisation enthalphy, metallic character, electronegativity, melting point and boiling point, density, character as reducing and nature of compound are observed in elements of boron group i.e. Group 13 elements having electronic configuration ns² np¹. Hence, they possess +3 oxidation state and their stability goes on decreasing as the atomic number increases. These elements also possess +1 oxidation state and the stability goes on increasing as the atomic number increases.

The chemical reactivity of group 13 elements are as given below. Group 13 elements do not combine directly with hydrogen but they combine indirectly to form hydride compounds. Boron forms a number of hydrides having molecular formula B_n H_n+4 and B_n H_n+6 which are known as boranes. The other elements of this group form polymeric hydrides. Group 13 elements form MX₃ type trihalides, where X = F, Cl, Br and I is unknown. AlCl₃ exists in dimer form. The group 13 elements form oxides and hydroxides having fomula M₂ O₃ and M(OH)₃ respectively. As the atomic number of elements goes on increasing, the acidic character of oxide and hydroxide goes on dcereasing. Elements of these group form octahedral complexes. Aluminium sulphate reacts and forms double salts with sulphate of NH⁺₄ and alkali metal ions having fomula M₂SO₄ A₂(SO4)₃.24H₂O or MAl(SO₄)₂.12H₂O where M = Na⁺, K⁺, Rb⁺ and  NH⁺₄ . The first element (Boron) of group 13 shows anomalous behaviour. Boron is chemically less reactive and almost inert with normal chemical reagents at normal temperature but reacts with strong oxidising agents and with some typical reagents like non-metal, acid alkali and metals. Some important compounds of boron are borax powder, boric acid and boron hydride. The properties and uses of aluminium are as given in the text. Aluminium reacts with acid and base so it is amphoteric in nature.

The group 14 includes elements carbon, silicon, germanium, tin and lead. The first element of this group is carbon, so it is also known as carbon group elements. Carbon shows catenation property due to its small size, high electronegativity and very high carbon-carbon bond energy. Due to typical characteristic of catenation it forms number of compounds which are studied in organic chemistry. It also forms compounds with metals and nonmetals. Group 14 elements have variation in properties like atomic radii, ionisation enthalpy electropositive character, electronegativity, melting points and boiling points density, catenation and allotropy. The oxidation state of group 14 elements are +2 and +4. The trends in chemical reactivity are as given in the text. The carbon shows anomalous behaviour. The crystalline allotropes of carbon are diamond, graphite and fullerenes. The physical properties and chemical properties are as given in the text. Some important compounds of carbon are halides of carbon, carbon disulphide, carbide compounds, carbon monoxide and carbon dioxide, and the method of  reparation and uses are as given in the text. The important compounds of silicon are silicon hydrides having general formula Si_n H_2n+2. The value of bond enthalpy for silicon-silicon is 297 kJmol^–1 hence catenation character is observed in silicon and it forms limited hydride compounds, having formula Si_n H_2n+2 where n = 1 to 8, and these compounds are also known as silanes. The stability of silane compounds are less compared to hydrides of carbon and hence reducing power is more. Silicon also forms silicon dioxide known as silica and more than 22 allotropic structures are known in which some are crystalline and some are amorphous. Silica is acidic and hence it dissolves in liquid alkali or alkaline carbonate to form silicate compounds. Silicon reacts with only F₂ and form SiF₄ while reacts with Cl₂ and form SiCl₄. The hydrolysis of SiCl₄ gives silicic acid and the mechanism for hydrolysis are in two steps. The silicones are synthetic materials containing Si - O - Si bond linkage. These  ompounds are polymeric substances containing R₂SiO reapeating unit. The general formula is (R₂ SiO)n, where R is methyl or phenyl group. The empirical formula is R₂SiO which is similar to that of organic compound, ketone, so it is called silicone. The prepartion, properties and uses are as given in the text. Approximately 95% of earth's crust consists of silicates and silica compounds, containing independent SiO₄^4- having tetrahedral structure. The types of silicates depending upon the number of corners (0, 1, 2, 3 and 4) of the SiO^-4₄ tetrahedron are shared with other tetrahedrons and based on that they are classified as given in the text. In a three dimensional structure of SiO₂, its Si⁴⁺ partially substituted by Al³⁺ gives aluminosilicate are called feldspar and zeolites. In zeolites the SiO^-4₄ - and  AlO^5-₄ . tetrahedron joined together in simple way to form three dimensional network. The uses of silicates are as a molecular sieves and shape selectives catalyst. One important catalyst of silicate is ZSM-5 used in petrochemical industry which converts alcohol directly into gasoline.

The first element of group 15, differs in many aspects from the other elements in the group. The reason for which is its smaller size, the capacity of formation of pπ–pπ triple bond between, nitrogen atoms and the nonavailability of d–orbitals. As we go down

from above in the group, variations are found in properties. Dinitrogen (N₂) can be prepared in the laboratory as well as on commercial level. The oxides of nitrogen element are N₂O, NO, N₂O₃, N₂O₄ and N₂O₅ which possess resonance forms.

Ammonia and nitric acid are compounds of nitrogen.

Phosphorus element exists as P₄ molecule. It has many allotropes. It forms hydrides, halides and oxoacid compounds.

Polonium element of group 16 is radioactive. Oxygen forms metal oxides with metals. Ozone is a strong oxidising agent. Sulphur element possessess different allotropes. Out of these α and β allotropes are very important. Sulphur element combines with oxygen and forms oxide compounds like SO₂ and SO₃. Out of the different oxoacids of sulphur, sulphuric acid is very important. It is called 'King of Chemicals.'

Astatine element of group 17 is radioactaive. As these elements require one electron to have stable electronic configuration, they are very reactive. As a result of this, the elements of this group are not available in free state, but are availalbe in the combined state as negative ions. The elements of this group form oxides, hydrogen halides, interhalogen compounds and oxoacid compounds.

Radon element of group 18 is radioactive. As the octet structure is complete in all the elements of this group they are chemically inert. Xenon element of this group, under specific reaction conditions combine with fluorine and oxygen elements and form fluoride and oxide compounds.

 

M.C.Q.

Boron Family

 

(1) Boron form covalent Compound due to

(a) Higher ionisation enthalpy (b) Lower ionisation enthalpy

(c) Small size (d) Both (a) and (c)

 

(2) In diborane the Two H-B-H angles are nearly

(a) 60° , 120°(b) 95° ,120° (c) 95° ,150° (d) 120° ,180°

 

(3) The stability of +1 oxidation state increases in the sequence

(a) Al<Ga<In<Tl (b) Tl<In<Ga<Al (c) In<Tl<Ga<Al (d)Ga<In<Al<Tl

 

(4) Which of the following is most acidic

(a) Na₂O (b) Mgo (c) Al₂O₃ (d) Cao

 

(5) Cohen Orthoboric acid (H₃BO₃) is strongly heated, the residue is

(a) Meta boric acid (b) Boron (c) Al₂O₃, 2H₂O (d) None of above

 

(6) Bauxite has the composition

(a) Al₂O₃ (b) Al₂O₃, H₂O (c) Al₂O₃ • 2H₂O (d) None of above

 

(7) Which one of the following is correct statement

(a) The hydroxide of aluminium is more acidic than that of boron

(b) The hydroxide of boron is basic, while that of aluminium is amphoteric

(c) The hydroxide of boron is acidic, while that of aluminium is amphoteric

(d) The hydroxide of boron & aluminium are amphoteric

 

(8) AlCl₃ is

(a) Anhydrous & covalent (b) Anhydrous & ionic

(c) covalent & basic (d) coordinate & acidic

 

(9) Aluminium (III) chloride forms a dimer because

(a) Higher coordination number can be achieved by aluminium

(b) Aluminium has high ionization energy

(c) Aluminium belongs to III group

(d) It cannot form a trimer

 

(10) Aluminium has a great affinity for oxygen & it’s oxidation is an exothermic process. This fact is used in

(a) Preparing thin foils of aluminium (b) Making utensils

(c) Preparing duralumin alloy (d) Thermite welding

 

(11) Which of the following is an amphoteric oxide.

(a) MgO (b) Al₂O₃ (c) Cl₂O₇ (d) Ti₂O₂

 

(12) When Al is added to KOH solution

(a) No action takes place (b) Oxygen is evolved

(c) Water is produced (d) Hydrogen is evolved

 

(13) Aluminium is more reactive than iron. But Aluminium is less easily corroded than iron because

(a) Aluminium is noble metal (b) Oxygen forms a protective oxide layer

(c) Iron undergoes reaction easily with water (d) Iron forms mono and divalent ions

 

(14) Aluminium vessels should not be washed with materials containing washing soda since

(a) Washing soda is expensive

(b) Washing soda is easily decomposed

(c) Washing soda reacts with aluminium to form soluble aluminate

(d) Washing soda reats with aluminium to form insoluble aluminium oxide

 

(15) Which of the statements about anhydrous aluminium chloride is corret

(a) It exists as AlCl₃ molecule (b) It is not easily hydrolysed

(c) It sublimes at 100°C under vaccum (d) It is a strong lewis base

 

(16) Number of water molecules in Mohr’s salt is

(a) 7 (b) 6 (c) 5 (d) 8

 

(17) The liquid field metal expanding on solidification is

(a) Ga (b) Al (c) Zn (d) Ca

 

(18) Aluminium chloride exists as dimer, Al₂Cl₆ in solid state as well as in solution of non-polar solvents such as benzene when dissolved in water gives

(a) [Al(OH)₆)^3- + 3HCl (b) [Al(H₂O)₆)^3- + 3Cl^- (c) Al³⁺ + 3Cl^- (d) Al₂O₃+6HCl

 

(19) The hardest substance amongst the following is

(a) Be2C (b) Graphite (c) Titanium (d) SiC

 

(20) Inorganic Benzene is

(a) B₂H₆ (b) B₃N₃H₆ (c) B₃O₃H₆ (d) (BH₃)₃

 

(21) Anhydrous AlCl₃ cannot be obtained from which of the following reactions

(a) Heating AlCl₃ • 6H₂O

(b) By Passing dry HCl over hot aluminium powder

(c) By Passing dry Cl₂ over hot aluminium powder

(d) By passing dry Cl₂ over a hot mixture of alumina and coke

 

(22) Diborane combines with ammonia at 120°C to give

(a) B₂H₆ NH₃ (b) B₂H₆. 2NH₃ (c) B₂H₆.3NH₃ (d) B₂H₆ . 4 NH₃

 

(23) Which metal burn in air at high temperature with the evolution of much heat.

(a) Cu (b) Hg (c) Pb (d) Al

 

(24) Aluminium hydroxide is soluble in excess of sodium hydroxide forming the ion

 

 

(25) Moissan boron is ________

(a) Amorphous boron of ultra purity (b) Crystaline boron of ultra purity

(c) Amorphous boron of low purity (d) Crystalline boron of low purity

 

(26) Which of the following is only acidic in nature

(a) Be(OH)₂ (b) Mg(OH)₂ (c) B(OH)₃ (d) Al(OH)₃

 

(27) Which of the following does not exist in free form

(a) BF₃ (b) BCl₃ (c) BBr₃ (d) BH₃

 

(28) Alumina is ________

(a) Acidic (b) Basic (c) Amphoteric (d) None of these

 

(29) Hydrogen gas will not produce

(a) Heated cupric oxide (b) Heated ferric oxide

(c) Heated stannic oxide (d) Heated aluminium oxide

 

(30) Conc.HNO₃ ________

(a) Reacts with aluminium vigrously

(b) Reacts with aluminium to form aluminium nitrate.

(c) Doesn’t react with aluminium

(d) Reacts with platinum

 

(31) Anhydrous AlCl₃ is obtained from

(a) Dilute HCl & aluminium metal (b) Aluminium & chlorine gas.

(c) Hydrogen chloride gas & aluminium metal (d) None of the above

 

(32) Which is true for an element & present in III group of the periodic table

(a) It is gas at room temperature (b) It has oxidation state of +4

(c) It forms R₂O₃ (d) It forms RX₂

 

(33) An aqueous solution of borax is

(a) neutral (b) acidic (c) basic (d) none

 

(34) Crystalline metal can be transformed into metallic glass by

(a) alloying (b) Pressing into thin plates

(c) slow cooling of molten metal (d) Very rapid cooling of the molten metal

 

(35) Which metal is protected by a layer of it own oxide

(a) Al (b) Ag (c) Au (d) Fe

 

(36) B(OH)₃ + NaOH → NaBO₂+Na[B(OH)₄] +H₂O How can this reaction is made to proceed in forward direction.

(a) Addition of cis Benzene - 1,2-diol (b) Addition of Borax

(c) Addition of trans-Benzene 1,2-diol (d) Addition of Na₂HPO₄

 

(37) An element A dissolves both in acid and alkali. It is an example of

(a) Allotropie nature of A (b) Dimorphic nature of A

(c) Amorphous nature of A (d) Amphoteric nature of A

 

(38) Which among the following is not a borane.

(a) B₂H₆ (b) B₃H₆ (c)B₄H₁₀ (d) None of these

 

(39) In Goldschmidt aluminothermic process, thermite contains

(a) 3 parts of Al₂O₃ and 4 Parts of Al (b) 3 parts of Fe₂O₃ and 2 parts of Al

(c) 3 Parts of Fe₂O₃ and 1 part of Al (d) 1 Part of Fe₂O₃ and 1 Part of Al

 

(40) Aluminium oxide is not reduced by chemical reactions since

(a) Aluminium oxide is reative (b) Reducing agents contaminate

(c) Aluminium oxide is highly stable (d) The process pollutes the environment

 

(41) Aluminium is not used

(a) In silvery paints (b) For making utensils

(c) As a reducing agent (d) As oxidizer in metalurgy

 

(42) Bauxite containing impurities of iron oxide is purified by

(a) Hoop’s Process (b) Serpeck’s Process (c) Bayer’s Process (d) Electrolytic process

 

(43) In the purification of Bauxite by Hall’s process

(a) Bauxite ore is heated with NaOH solution at 50°C

(b) Bauxite ore is heated with NaHCO₃

(c) Bauxite ore is fused with coke and heated at 1800°C in a current of nitrogen

(d) Bauxite ore is heated with NaHCO₃

 

 

(48) The type of hybridization of boron in diborane is.

(a) Sp- hybridization (b) Sp² - hybridization (c) Sp³ - hybridization (d) Sp³d² - hybridization

 

(49) Identify the statement that is not correct as far as structure of diborane is concerned.

(a) There are two bridging hydrogen atoms in diborane

(b) Each boron atom forms four bonds in diborane

(c) The hydrogen atoms are not in the same plane in diborane

(d) All B-H bonds in diborane are similar

 

(50) Soft heavy metal melts at 30°C and is used in making heat sensitive thermometers, the metal is

(a) Gallium (b) Sodium (c) Potassium (d) cesium

 

(51) In the reaction B₂O₃ + C + Cl₂ → A + CO . The A is

(a) BCl₃ (b) BCl₂ (c) B₂Cl₂ (d) CCl₂

 

(52) The most acidic of the following compound is

(a) P₂O₃ (b) Sb₂O₃ (c) B₂O₃ (d) As₂O₃

 

(53) Heating an aqeous solution of aluminium chloride to dryness will give

(a) AlCl₃ (b) Al₂Cl₆ (c) Al₂O₃ (d) Al(OH)Cl₂

 

(54) Which of the following is the electron deficient molecule

(a) B₂H₆ (b) C₂H₆ (c) PH₃ (d) SiH₄

 

(55) The structure of diborane Contains

(a) four 2c - 2e bonds and two 3c - 2e bonds

(b) Two 2c - 2e bonds and Four 3c - 2e bonds

(c) Two 2c - 2e bonds and two 3c - 3e bonds

(d) Four 2c - 2e bonds and four 3c - 2e bonds

 

(56) In Hall Heroult's process, the main reagent is mixed with

(a) B₂ H₆ (b) C₂ H₆ (c) Na₃AlF₆ (d) SiH₄

 

(57) Which of the following statement in incorrect

(a) Al react with excess NaOH to give Al (OH)₃

(b) NaHCO₃ on hating gives Na₂CO₃

(c) Pure sodium metal dissolves in liquid ammonia to give blue solution

(d) NaOH reats with glass to give sodium silicate

 

(58) Which of the following is nonmetal

(a) Ga (b) In (c) Th (d) B

 

(59) Which one of the following statements about diborane is not true

(a) The B atoms in it are SP³ hybridised

(b) It contains two 3-centre-2-electron bonds

(c) All B-H bond lengths in it are equal due to resonance

(d) The molecule contains 12 valence electrons

 

(60) Boron shows single oxidation state due to absence of

(a) Inert pair effect (b) Screening effect

(c) Isotope effect (d) None

 

 

(63) In which of the following molecules is hydrogen bond absent

(a) Water (b) Inorganic benzene (c) Diborane (d) Methanol

 

(64) The tendency of BF₃ , BCl₃ & BBr₃ to behave as lewis acid decreases in the sequence

(a) BF₃ > BCl₃ >BBr₃ (b) BCl₃ > BF₃ > BBr₃

(c) BBr₃ > BCl₃ > BF₃ (d) BBr₃ > BF₃ > BCl₃

 

(65) Which one of the following molecular hydrides acts a a lewis acid

(a) CH₄ (b) NH₃ (c) H₂O (d) B₂H₆

 

 

M.C.Q. 

CARBON FAMILY

 

(1) The compound which does not possess a peroxide linkage is

(A) Na₂O₂ (B) CrO₅ (C) H₂SO₅ (D) PbO₂

 

(2) Soldiers of Napolean army while at Alps during freezing winter suffered a serious problem as regards To the tin buttons of their uniforms. white metallic tin buttons got converted to grey powder. This Transformation is related to

(A) A change in the partial pressure of oxygen in the air

(B) A change in the crystalline structure of tin

(C) An interaction with nitrogen of air at very low to temperatures

(D) An interaction with water vapour contained in the humid air.

 

 

 

(7) Glass reacts with HF to produce

(A) SiF₄ (B) H₂SiF₆ (C)H₂SiO₃ (D) Na₃AlF₆

 

(8) Extraction of lead by reduction methods done by

(A) adding more galena into reverberatory furnace

(B) Adding more lead sulphate in reverberatory furnace

(C) Adding more galena and coke into the reverberatory furnace

(D) Self reduction of oxide form sulphide present in the furnace.

 

(9) Which is used to produce smoke screen

(A) Calcium phosphide (B) Zinc sulphide (C) Sodium carbonate (D) Zinc phosphide

 

(10) When tin is treated with concentrated nitric acid

(A) It is converted in to stannous nitrate (B) It is converted in to stannic nitrate

(C) It is converted in to metastannic acid (D) It becomes passive

 

(11) In lll A group Tl (thallium) shows +1 Oxidation state while other members show +3 oxidation state. Why?

(A) Presence of lone pair of electron in Tl. (B) Inert pair effect

(C) Large Ionic redius of Tl ion (D) None

 

(12) Carbon suboxide C₃O₂ has

(A) Linear structure (B) Bent structure

(C) Trigonal planar structure (D) Distorted tetrahedral structure.

 

(13) Which of the following is a mixed oxide

(A) Fe₂O₃ (B) PbO₂ (C) Pb₃O₄ (D) BaO₂

 

(14) Noble gases are absorbed in

(A) Anhydrous CaCl₂ (B) Charcoal (C) Conc, H₂SO₄ (D) Coconut

 

(15) Solid CO₂ is known as dry ice because

(A) it melts as 0^oC (B) it evaporates at 40^oC

(C) it evaporates at - 78^oC without melting (D) its boiling point is more than 199^oC

 

(16) Carborundum is

(A) SiC (B) AlCl₃ (C)Al₂(SO₄)₃ (D) Al₂O₃. 9H₂O

 

(17) H₂O₂ on reaction with PbS gives

(A) PbO (B) PbSO₄ (C) PbO₂ (D) PbHSO₄

 

(18) Which of the following statements is incorrect

(A) Silicon is extensively used as a semiconductor (B) Carborandum is SiC

(C) Silicon occurs in free state in nature (D) Mica contains the element silicon

 

(19) SiF₄ gets hydrolysed gives

(A) SiO₂ (B) Si(OH)₂F₂ (C) H₂SiF₆ (D)Si(OH)₄

 

(20) Silicon is an important constituent of

(A) Rocks (B) Amalgams (C) Chlorophyll (D) Haemoglobin

 

(21) The number of unpaired electrons in carbon atom is

(A) 1 (B) 2 (C) 3 (D) 4

 

(22) Colour is imparted to glass by mixing

(A) Synthetic gas (B) Metal oxide

(C) Oxide of non - metal (D) Coloured Salt

 

(23) Which of the following glass is used in making wind screen of automobiles.

(A) Crook's Glass (B) Jena Glass (C) Safety Glass (D) Pyrex Glass

 

(24) Which of the following is insoluble in water

(A) Na₂CO₃ (B) CaCO₃ (C) ZnCO₃ (D) Al₂(CO₃)₃

 

(25) In which of the following the inert pair effect is most prominent

(A) C (B) Si (C) Ge (D) pb

 

(26) Plumbosoluancy implies dissolution of lead in

(A) Bases (B) Acids (C) Ordinary Water (D) CuSO₄

 

(27) Which of the following glass is used to make lenses and prisms

(A) Flint (B) Jena (C) Pyrex (D) Quartz

 

(28) N₂ gas is absorbed by

(A) Calcium hydroxide (B) Ferrous sulphate

(C) Calcium Carbide (D) Aluminium Carbide

 

(29) White lead is

(A) PbCO₃ (B) PbCO₃. PbO (C) 2PbCO₃.Pb(OH)₂ (D) 2PbSO₄. PbO.

 

(30) Red lead is

(A) Pb₃O₄ (B) PbO (C) PbO₂ (D) Pb₄O₃

 

(31) Name of the structure of silicates in which three oxygen atoms of [SiO₄]^4– are shared is

(A) pyrosilicate (B) Sheet Silicate

(C) Linear chain Silicates (D) Three dimensional Silicate

 

(32) A metal used in storage battries is

(A) Copper (B) Lead (C) Tin (D) Nickel

 

(33) Solder is an alloys of

(A) Pb+Zn+Sn (B) Pb+Zn (C) Pb+Sn (D) Sn+Zn

 

(34) Which of the following statement is correct with respect ot the property of elements in the carbon Family with an increase in atomic number their.

(A) Atomic size decreases (B) Ionization energy increases

(C) Metallic character decreases (D) Stability of +2 oxidation state increases

 

(35) Lapis lazuli is

(A) Ferrous sulphate (B) Copper Sulphate

(C) Sodium Alumino Silicate (D) Zinc Sulphate

 

(36) 'Lead pencil' contains

(A) PbS (B) Graphite (C) FeS (D) Pb

 

(41) Diamond is harder than graphite because

(A) Graphite is planar (B) Diamond has free electron

(C) Graphite is sp3 hybridized (D) None

 

(42) Supercritical CO₂ is used as

(A) Dry ice (B) Fire fighting

(C) A Solvent for extraction of organic compound from natural sources

(D) A highly inert medium for carrying out various reactions.

 

(43) Products formed on heating Pb(NO₃)₂ are

(A) PbO, N₂, O₂ (B) Pb(NO₂)₂, O₂ (C) PbO, NO₂, O₂ (D) Pb, N₂, O₂

 

(44) Which of the following lead oxide is 'Sindhur'

(A) PbO (B) PbO₂ (C) Pb₂O₃ (D) Pb₃O₄

 

(45) Percentage of lead in lead pencil is

(A) O (B) 20 (C) 80 (D) 70

 

(46) Pb reacts with dilute HNO₃ gives

(A) NO (B) NH4NO₃ (C)N₂O₅ (d) NO₂

 

(47) In silicon dioxide

(A) Each Si atom is surrounded by four oxygen atoms and each oxygen atom is bonded to two Si Atoms

(B) Each Si atom is surrounded by four O₂ atoms and each O₂ by 2Si atom

(C) Si atom is bonded to two oxygen atoms

(D) None of above

 

(48) Litharge is chemically

(A) PbO (B) PbO₂ (C) Pb₃O₄ (D) Pb(CH₃COO)₂

 

(49) Which of the following has most density

(A) Fe (B) Ca (C) B (D) Pb

 

(50) Red lead is an example of an ______ Oxide

(A) Basic (B) Super (C) Mixed (D) Amphoteric

 

(51) Element showing the phenomenon of allotropy is ______

(A) Alluminium (B) Lead (C) Tin (D) Copper

 

(52) Which of the following is a metalloid

(A) Bi (B) Sn (C) Ge (D) C

 

(53) Which gas is liberated when Al₄C₃ is hydrolysed

(A) CH₄ (B) C₂H₂ (C) C₂H₆ (D) CO₂

 

(54) Which of the following attacks glass

(A) HCl (B) HF (C) HI (D) HBr

 

(55) Dry ice is

(A) Solid CO₂ (B) Solid NO₂ (C) Solid SO₂ (D) None

 

(56) SiCl₄ on hydrolysis forms 'X' & HCl Compound 'X' loses water at 1000°C & gives 'Y'. Compound 'X' & 'Y' are respectively.

(A) H₂SiCl₆, SiO₂ (B) H₂SiO₄, Si (C) SiO₂, Si (D) H₄SiO₄, SiO₂

 

 

(63) Pure silicon doped with phosphorous is a

(A) Metallic conductor (B) Insulator

(C) n - type semiconductor (D) P - type semiconductor

 

(64) Carbogen is a mixture of

(A) CO + N₂ (B) CO + O₂ (C) CO₂+ O₂ (D) C + H₂ + N₂

 

(65) The element evolving two different gases on reaction with conc. H₂SO₄ is ______.

(A) P (B) C (C) Hg (D) S

 

(66) Carborundum is obtained when silica is heated at high temperature with

(A) C (B) CO (C) CO₂ (D) CaCo₃

 

(67) Lead pipes are corroded quickly by

(A) DiL H₂SO₄ (B) Conc.H₂SO₄ (C) Acetic Acid (D) Water

 

(68) Which is the correct oxidation state of lead

(A) +2, +4 (B) +1, +2 (C)+3, +4 (D) +4

 

(69) Quartz is an example of

(A) Chain Silicate (B) Sheet Silicate

(C) Cyclic Silicate (D) 3D network Silicate

 

 

 

 

NITROGEN FAMILY : 15

 

(1) Which of the following elements does not form stable diatomic molecules

(A) Iodine (B) Phosphorous (C)Nitrogen (D) Oxygen

 

(2) HNO₃ + P₂O₅ → A + B, A is an Oxyacid of phosphorous and B is an oxide of N. A and B respectively are

(A) H₃PO₄, N₂O₃ (B) HPO₃, N₂O₃ (C) HPO₃, N₂O₅ (D) H₃PO₃, N₂O₅

 

(3) When heated NH₃ is passed over CuO gas evolved is

(A) N₂ (B) N₂O (C) HNO₃ (d) NO₂

 

(4) When concentrated nitric acid is heated it decomposes to give

(A) O₂ and N₂ (B) NO (C) N₂O₅ (D) NO₂ and O₂

 

(5) Which of the following metal produces nitrous oxide with dil HNO₃

(A) Fe (B) Zn (C) Cu (D) Ag

 

(6) Which Nitrogen trihalides is least basic

(A) NF₃ (B) NCl₃ (C)NBr₃ (D) NI₃

 

(7) P₄O₆ reacts with water to give

(A) H₃PO₃ (B) H₄P₂O₇ (C)HPO₃ (D) H₃PO₄

 

(8) Which does not form complex

(A) N (B) P (C) As (D) Bi

 

(9) Nitrogen is relatively inactive element because

(A) it atom has a stable Electronic Configuration

(B) it has low atomic radius

(C) Its electro negativity is fairly high

(D) Dissociation energy of 15 molecule is fairly high

 

(10) Nitrogen dioxide is released by heating

(A) Pb(NO₃)₂ (B) KNO₃ (C) NaNO₂ (D) NaNO₃

 

(11) Concentrated nitric acid oxidizes cane sugar to

(A) CO₂ and H₂O (B) CO and H₂O

(C) CO, CO₂ and H₂O (D) Oxalicacid and water

 

(12) Red P can be obtained from white P by

(A) Heating it with a catalyst in an inest atmosphere

(B) Distilling it in an inert atmosphere

(C) Dissolving it in carbon disulphide and crystalising

(D) Melting it an pouring the liquid into water

 

(13) When aluminium phosphide is reacted with dil H₂SO₄

(A) SO₂ is liberated (B) PH₃ is evolved

(C) H₂S is evolved (D) H₂ is evolved

 

(14) Cyanamide process is used in the formation of

(A) N₂ (B) HNO₃ (C) NH₃ (D) PH₃

 

(15) Which statement is wrong for NO

(A) It is anhydride of nitrous acid (B) It dipole moment in 0.22D

(C) It forms dimer (D) It is paramagnetic

 

(16) Solid PCl5 exists as

(A) PCl₅ (B) PCl₄⁺ (C) PCl₆^- (D) PCl₄⁺ and PCl₆^-

 

(17) How can you synthesise nitric oxide in the lab

(A) Zinc with cold and dilute HNO₃ (B) Zinc with Conc. HNO₃

(C) Cu with cold and dil HNO₃ (D) Heating NH₄ NO₃

 

(18) Which of the following is a cyclic phosphate

(A) H₅P₃O₁₀ (B) H₆P₄O₁₃ (C) H₅P₅O₁₅ (D) H₇P₅O₁₆

 

(19) Which catalyst is used in the haber process for the manufacture of NH₃

(A) Pt (B) Fe+Mo (C) CuO (D) Al₂O₃

 

(20) Which of the following has the highest dipole moment

(A) NH₃ (B) PH₃ (C) SbH₃ (D) ASH₃

 

(21) Which salt can be classified as an acid salt

(A) Na₂SO₄ (B) BiOCl (C) Pb(OH)Cl (D) Na₂HPO₄

 

(22) Which of the following is manufactured from the molecular nitrogen by bacteria

(A) NO₃ (B) NO₂ (C) Amino acids (D) Ammonia

 

(23) Which of the following Tendencies remains unchanged on going down in the nitrogen family

(A) Highest Oxi. State (B) Non - metallic character

(C) Stability of hydrides (D) Physical state

 

(24) (NH₄)₂ Cr₂O₇ on heating liberates a gas. The same gas will be obtained by

(A) heating NH₄NO₂ (B) Heating NH₄NO₃

(C) Treating H₂O₂ and NaNO₂ (D) Treating MF₃N₂ with H₂O

 

(25) When plants and animals decay, the organic N is converted in to inorganic N. The inorganic N is in the form is

(A) NH₃ (B) Elements of N (C) Nitrates (D) Nitrides

 

(26) In an organic compound , phosphorous in estimated as

(A) Mg₂P₂O₇ (B) Mg₃(PO₄)₂ (C) H₃PO₄ (D) P₂O₅

 

(27) Producer gas is a mixture of

(A) CO and N₂ (B) CO₂ amd H₂ (C) CO and H₂ (D) CO₂ and N₂

 

(28) Ammonium nitrate decomposes on heating in to

(A) NH₃ and HNO₃ (B) Nitrous oxide and H₂O

(C) N, H, O₃ (D) Nitric Oxide, NO₂, H₂

 

(29) Non - Combustible hydride is

(A) NH₃ (B) PH₃ (C) ASH₃ (D) SbH₃

 

(30) The element which catches fire in air at 30°C and is stored under water is

(A) Calcium (B) Sodium (C) Phosphorous (D) Zinc

 

(31) Which of the following acid exist in polymeric form

(A) HPO₃ (B) H₄P₂O₇ (C) H₃PO₄ (D) None

 

(32) Dehydrated phosphorous trichloride in H₂O gives

(A) HPO₃ (B) H₃PO₄ (C) H₃PO₂ (D) NF₃

 

(33) Which of the following is not hydrolysed

(A) AsCl₃ (B) PF₃ (C) SbCl₃ (D) NF₃

 

(34) The strongest base is

(A) NH₃ (B) PH₃ (C) AsH₃ (D) SbH₃

 

(35) The cyaide ion, CN^–, N₂ are iso electronic. But in contrast to CN^–, N₂ is chemically inert because of

(A) Low bond energy (B) Absence of bond polarity

(C) Unsymmetrical electron distribution

(D) Presence of more number of electron in bonding orbilats

 

(36) When lighting flash is produced, which gas may form

(A) Nitrous Oxide (B) Nitric Oxide

(C) Dinitrogen in oxide (D) Nitrogen pentoxide

 

(37) A mixture of ammonia and air at about 800°C in the presence of Pt gauze forms

(A) N₂O (B) NO (C) NH₂OH (D) N₂O₃

 

(38) Which of the following is the most basic oxide

(A) Bi₂O₂ (B) SeO₂ (C) Al₂O₃ (D) Sb₂O₃

 

(39) Ammonia gas can be collected by the displacemet of

(A) Conc. H₂SO₄ (B) Brine (C) Water (D) Mercury

 

(40) The chemical used for cooling in refrigeration is

(A) CO₂ (B) NH₄OH (C) NH₄Cl (D) Liquid NH₃

 

(41) Reaction of PCl₃ and PhMgBr. Would give

(A) Bromobanzene (B) Chlorobenzene

(C) Triphenyl phosphine (D) Dichlorobenzene

 

(42) Which of the following P is most stable

(A) Red (B) White (C) Black (D) All stable

 

(43) The least stable hydride of 75th group elements in

(A) NH₃ (B) PH₃ (C) AsH₃ (D) BiH₃

 

(44) The chemical formula of Tear gas is

(A) COCl₂ (B) CO₂ (C) Cl₂ (D) CCl₃NO₂

 

(45) PH4I + NaOH forms

(A) PH₃ (B) NH₃ (C) P₄O₆ (D) P₄O₁₀

 

(46) Which is not an acid salt

(A) NaH₂PO₃ (B) NaH₂PO₂ (C) Na₃HP₂O₆ (D) Na₄P₂O₇

 

(47) The number of hydroxyl group in pyrophosphoric acid is

(A) 3 (B) 4 (C) 5 (D) 7

 

(48) Which of the following has the highest proton affinity

(A) Stilbine (B) Arsine (C) Phosphine (D) Ammonia

 

(49) Which of the following has highest B.P

(A) NH₃ (B) PH₃ (C) AsH₃ (D) SbH₃

 

(50) Which of the following exihibits highest solubility in H₂O

(A) NH₃ (B) PH₃ (C) AsH₃ (D) SbH₃

 

(51) HNO₃ in aqueous solution yields

(A) NO₃^- and H⁺ (B) NO₃^- and H₃O⁺

(C) NO₂^- and OH^- (D) N₂O₅ and H₂O

 

(52) The three important oxidation state of P are

(A) -3, +3, +5 (B) -3, +3, -5 (C) -3, +4, -4 (D) -3,+3,+4

 

(53) Which show maximum valency

(A) P (B) Tin (C) Sb (D) Bi

  

(54) Which oxide of N is obtained on heating ammonium nitrate at 250°C

(A) Nitric oxide (B) Nitrous oxide

(C) Nitrogen dioxide (D) Dinitrogen oxide

 

(55) The number of P-O-P bonds in cyclic metaphos phoric acid is

(A) 0 (B) 2 (C) 3 (D) 4

 

(56) The product oblained by heating (NH₄)₂SO₄ and KCNO is

(A) Hydrocyanic acid (B) Ammonia

(C) Ammonium cyanide (D) Urea

 

(57) Which compound is related to haber’s process

(A) CO₂ (B) H₂ (C)NO₂ (D) NH₃

 

(58) The carbonate which does not leave a residue on heating is

(A) Na₂CO₃ (B) PH₃ (C) SbH₃ (D) AsH₃

 

(59) Aquaregia is

(A) 1:3 conc. HNO₃ and conc. HCl (B) 1:2 conc. HNO₃ and conc. HCl

(C) 3:1 conc. HNO₃ and conc. HCl (D) 2:1 conc. HNO₃ and conc. HCl

 

(60) Which of the following hydrides is least stable

(A) AsH₃ (B) SbH₃ (C) NH₃ (D) PH₃

 

(61) The most stable hydride is

(A) NH₃ (B) PH₃ (C) AsH₃ (D) SbH₃

 

(62) Which has the lowest boiling point

(A) NH₃ (B) PH₃ (C) AsH₃ (D) SbH₃

 

(63) Which is the most explosive

(A) NCl₃ (B) PCl₃ (C) AsCl₃ (D) All

 

(64) The most acidic is

(A) AS₂O₃ (B) P₂O₃ (C) Sb₂O₃ (D) Bi₂O₃

 

(65) Non-existing compound is

(A) PH₄I (B) As₂O₃ (C) SbCl₂ (D) As₂H₃

 

(66) Pure N₂ gas is obtained from

(A) NH₃ + NaNO₂ (B) NH₄Cl + NaNO₂ (C) N₂O + Ca (D) (NH₄)₂Cr₂O₇

 

(67) Pure nitrogen can be prepared from

(A) NH₄OH (B) Ca₃N₂ (C) NH₄NO₂ (D) Ba(NO₃)₂

 

(68) NO₂ is released by heating

(A) Pb(NO₃)₂ (B) KNO₃ (C) NaNO₂ (D) NaNO₃

 

(69) Which of the following is neutral

(A) N₂O₅ (B) N₂O₃ (C) N₂O₄ (D) N₂O

 

(70) Which of the following is acidic

(A) NH₃ (B) N₂H₄ (C)N₂H₂ (D) N₃H

 

(71) Laughing gas is prepared by heating

(A) NH₄Cl (B) (NH₄)₂SO₄ (C) NH₄Cl + NaNO₃ (D) NH₄NO₃

 

(72) P₄O₆ reacts with water to give

(A) H₃PO₃ (B) H₄P₂O₇ (C) HPO₃ (D) H₃PO₄

 

(73) Electrolysis temperature is maximum

(A) AsH₃ (B) NH₃ (C) PH₃ (D) SbH₃

 

(74) Which of the following is not hydrolysed

(A) AsCl₃ (B) PF₃ (C) SbCl₃ (D) NF₃

 

(75) On adding H₂O to BiCl₃ solution in HCl, the compound produced is

(A) Bi₂O₃ (B) Bi(OH)₃ (C) BiOCl (D) BiOCl₂

 

(76) N, P , As, Sb , Bi elements belong to

(A) VA Group (B) IV A Group (C) VII A Group (D) Hg(OH)₂

 

(77) Which of the following elements occur free in nature

(A) Nitrogen (B) Phosphorus (C) Arsenic (D) Antimony

 

(78) Which of the following elements of group VA does not show allotropy

(A) N (B) Bi (C) P (D) As

 

 

 

M.C.Q.

OXYGEN FAMILY

 

(1) Which is not easily soluble in water

(A) H₂ (B) O₂ (C) SO₂ (D) CO₂

 

(2) The molecular formula of sulphur is

(A) S (B) S₂ (C)S₄ (D) S₈

 

(3) All the elements of oxygen family are

(A) Non - metal (B) Matalloids (C) Radioactive (D) Plymorphic

 

(4) The triatomic species of element oxygen is known as

(A) Azone (B) Polyzone (C) Trizone (D) Ozone

 

(5) Which of the following acts as pickling agent

(A) HNO₃ (B) HCl (C) H₂SO₄ (D) HNO₂

 

(6) Which of the following is no suitable for use in dasiccator to dry substance

(A) conc H₂SO₄ (B) Na₂SO₄ (C) CaCl₂ (D) P₄O₁₀

 

(7) The catalyst used in manufacture of by contact process

(A) Al₂O₃ (B) Cr₂O₃ (C) V₂O₃ (D) MnO₂

 

(8) Which of the following is the best scientific method to test presence of water in a liquid

(A) Taste (B) Smell

(C) use of litmus paper (D) use of onhydrous CaSO₄

 

(9) Which of the following sulphate is insoluble in water

(A) CaSO₄ (B) CdSO₄ (C) PbSO₄ (D) Bi₂(SO₄)₃

 

(10) When sulphur is boiled with Na₂SO₃ solution, the compound formed is

(A) Sodium Sulphide (B) Sodium Sulphate

(C) Sodium persulphate (D) Sodium thiosulphate

 

(11) Number of unpaired electrons in sulphur is

(A) 2 (B) 6 (C) 8 (D) 1

 

(12) H₂S reacts with O₂ in restricted supply of O₂ to form

(A) H₂O + S (B) H₂O + SO₂ (C) H₂O + SO₃ (D) H₂SO₄ + S

 

(13) Which of the following mixlure is chromic acid

(A) K₂Cr₂O₇ and Con. H₂SO₄ (B) K₂Cr₂O₇ and HCl

(C) K₂SO₄ and Con. H₂SO₄ (D) H₂SO₄ and HCl

 

(14) Among KO₂, NO₂^- , BaO₂ and NO₂⁺ unpaired electron is present in

(A) NO₂⁺ and BaO₂ (B) KO₂ and BaO₂ (C) KO₂ (D) BaO₂

  

(15) Which of the element of the oxygen family is most poisonous to human race

(A) O (B) S (C) Se (D) None

 

(16) Super phosphate is the mixture of

(A) Calcium phosphate and H₂SO₄ (B) Sodium phosphate and H₂SO₄

(C) Potassium phosphate and H₂SO₄ (D) None

 

(17) Which of the following dissociates to give H⁺ easily

(A) H₂O (B) H₂S (C)H₂Te (D) H₂Se

 

(18) H₂SO₄ reacts with PCl₅ to give

(A) Thoinyl chloride (B) Sulphur monochloride

(C) Sulphur chloride (D) Sulphur utrachloride

 

(19) Among H₂O, H₂S, H₂Se and H₂Te the one with highest boiling point

(A) H₂O (B) H₂Te (C) H₂S (D) H₂Se

 

(20) Which of the following is used in artificial respiration

(A) O₂ + CO₂ (B) O₂ + CO (C) O₂ + H₂ (D) All of these

 

(21) Carbogen is

(A) Pureform of C (B) COCl₂

(C) Mixture of CO and CO₂ (D) O₂ & CO₂

 

(22) The products of the chemical reaction between Na₂S₂O₃, Cl₂ and H₂O are

(A) S+ HCl + Na₂S (B) S + HCl + Na₂SO₄

(C) S + HCl + Na₂SO₃ (D) S + NaCCO₃ + H₂O

 

(23) The incorrect statement among the following is

(A) C₆₀ is an allotropic form of carbon

(B) O₃ is an allotropic form of oxygen

(C) S₈ is only allotropic form of sulphur

(D) Red phosphorous is more stable in air than while phosphorous

 

(24) Hypo is used in photography because of its

(A) Reducing behavior (B) Oxidising behavior

(C)Complex forming behavior (D) Reaction with light

 

(25) Aqueous solutions of H₂S and SO₂ when mixed together yield

(A) Sulphur and water (B) Sulphur trioxide and water

(C) Hydrogen peroxide and sulphur (D) Hydrogen and sulphurous acid

 

(26) An example of a neutral oxide is

(A) No (B) CO₂ (C) CaO (D) ZnO

 

(27) Which of the following is used to absorb sulphur dioxide

(A) conc H₂SO₄ (B) KOH Solution (C)Water (D) Anhydrous CaCl₂

 

(28) When SO₂ is passed through acidified K₂Cr₂O₇ solution

(A) Solution turns blue (B) Solution decolourizes

(C) SO₂ is reduced (D) Green Cr₂(SO₄)₃ is formed

 

(29) Which of the following is oxidized by SO₂

(A) Mg (B) K₂Cr₂O₇ (C)KMnO₄ (D) All

 

(30) A salt of sulphurous acid is called

(A) Sulphate (B) Sulphurate (C) Sulphite (D) Sulphid

 

(31) The final acid obtained during the manufacture of H₂SO₄ by contact process

(A) H₂SO₄(conc.) (B) H₂SO₄(dil) (C) H₂SO₄ (D) H₂S₂O₇

 

(32) Which compound acts as an oxidizing as well as reducing agent

(A) SO₂ (B) MnO₂ (C) Al₂O₃ (D) CrO₃

 

(33) Bleaching action of SO₂ is due to

(A) Reduction (B) Oxidisation(oxide) (C) Hydrolysis (D) Acidic nature

 

(34) About H₂SO₄ which is incorrect

(A) Reducing agent (B) Dehydrating agent (C) sulphonating agent (D) Highly Viscous

 

(35) In the reaction

2Ag + 2H₂SO₄ → Ag₂ SO₄ + 2H₂O + SO₂, H₂SO₄ acts as

(A) Reducing agent (B) Oxidising agent (C) Catalytic agent (D) Dehydrating agent

 

 

 

 

(44) Which element is found in free state

(A) I (B) S (C) Ur (D) Ag

 

(46) In the preparation of sulphuric acid, V₂O₅ is used is the reaction, which is

(A) S + O₂ → SO₂ (B) 2SO₂ + O₂ →2SO₃

(C) SO₂ + H₂O → H₂SO₄ (D) N₂ + 3H₂ → 2NH₃

 

(47) Point out of in which of the following properties of oxygen differs from the rest of the members of its family (Group - VIA)

(A) High value of ionization energy (B) Oxydation state (2,4,6)

(C) Polymorphism (D) Formation of hydrides

 

(48) Ozone turns trimethyl paper

(A) Green (B) Violet (C) Red (D) Black

 

(49) No of atoms in one molecules of sulphur is

(A) 8 (B) 4 (C) 3 (D) None of these

 

(50) Bond angle is minimum for

(A) H₂O (B) H₂S (C) H₂Se (D) H₂Te

 

(51) A solution of SO₂ in water reacts with H₂S precipating sulphur. Here SO₂ acts as

(A) Oxidising agent (B) Reducing agent (C) Acid (D) Catalyst

 

(52) Whe SO₂ is passed through cupric chloride solution

(A) White precipitate is obtained (B) Solution becomes colouless

(C) Solution becomes colourless & White ppt is obtained of Cu₂Cl₂

(D) No Change

 

(53) Which of the following is acidic

(A) SO₃ (B) N₂O (C) BeO (D) HgO

 

(54) Which of the elements listed below occurs in allotropic forms

(A) Iodine (B) Copper (C) Sulphur (D) Silver

 

(55) Oxygen was discovered by

(A) Priestly (B) Scheele (C) Boyle (D) Cavendish

 

(56) Shape of O₂F₂ is similar to that of

(A) C₂F₂ (B) H₂O₂ (C) H₂F₂ (D) C₂H₂

 

(57) Which of the following is not a chalcogen

(A) O (B) S (C) Se (D) Na

 

(58) Which of the following is a suboxide

(A) Ba₂O (B) Pb₂O (C) C₃O₂ (D) ZnO

 

(59) KO₂ + CO₂ → ? (gas)

(A) H₂ (B) N₂ (C) O₂ (D) CO

 

(60) H₂SO₄ acts as dehydrating agent in its reaction with

(A) H₂C₂O₄ (B) Ba(OH)₂ (C) KOH (D) Zn

 

(61) A gas that can not be collected over water is

(A) N₂ (B) O₂ (C) SO₂ (D) PH₃

 

(62) The molecular formula of dithionic acid is

(A) H₂S₂O₄ (B) H₂S₂O₆ (C) H₂S₂O₅ (D) H₂S₂O₇

 

(63) Oxygen is not evolved on reaction of ozone with

(A) H₂O₂ (B) SO₂ (C) Hg (D) KI

 

(64) α and β form of sulphur both are stable at

(A) 369oC (B) 369K (C) 4oC (D) 0oC

 

(65) SO₂ + H₂S → X The final product is

(A) H₂O + S (B) H₂SO₄ (C) H₂SO₃ (D) H₂S₂O₃

 

(66) Sulphur in +3 oxidation state is present in

(A) Sulphurous acid (B) Pyrosulphuric acid

(C) Dithionous acid (D) Thiosulphuric acid

 

(67) H₂S is not a/an

(A) Reducing agent (B) Acidic (C) Oxidising agent (D) None

 

(68) Which one of the following is non-reducing

(A) H₂S (B) H₂Te (C) H₂Se (D) H₂O

 

(69) When PbO₂ reacts with conc. HNO₃ the gas evolved is

(A) NO₂ (B) O₂ (C) N₂ (D) N₂O

 

(70) The most efficient agent for the absorption of SO₃ is

(A) 80% H₂SO₄ (B) 98% H₂SO₄(C) 50% H₂SO₄ (D)20% H₂SO₄

 

(71) In presence of moisture , SO₂ can

(A) Act as oxidant (B) Lose electron (C) Gain electron (D) Not act as reductant

 

 

M.C.Q.

HALOGENS FAMILY

(1) The correct order of thermal stability of hydrogen halide.

(A) HI > HBr > HCl > HI (B) HF > HCl > HBr > HI

(C) HCI < HF < HBr < HI (D) HI > HCl > HF > HBr

 

(2) Phosgene is common name of

(A) Carbonyl chloride (B) Phosphine

(C) Phosphorus Oxychloride (D) Phosphorus trichloried

 

(3) The solubility of iodine in water increases in presence of

(A) Alcohol (B) Chloroform

(C) Sodium hydroxide (D) Potassium trichloride

 

(4) On boiling an aqueous solution of KClO₃ with iodine the following is obtained

(A) KClO₃ (B) KClO₄ (C) KClO₂ (D) KIO₃

 

(5) Colour of iodine is disappeared by shaking it with aqueous solution of

(A) H₂SO₄ (B) Na₂S₂O₃ (C) Na₂S (D) Na₂SO₄

 

(6) The stability of interhalogen compound is in order

(A) IF₃ > UF₃ > BrF₃ (B) BrF₃ > IF₃ > ClF₃

(C) IF₃ > BrF₃ > ClF₃3 (D) ClF₃ > IF₃ > BrF₃

 

(7) Bromine is obtained on commercial scale from

(A) Caliche (B) Carnellite (C) Common Salt (D) Cryolite

 

(8) Chlorine was discovered by

(A) Davy (B) Priestley (C) Ratherlford (D) Sheele

 

(9) Bromine is liberated when aqueous solution of potassium bromide is treated with

(A) Cl (B) I₂ (C) Dilute H₂SO₄ (D) SO₂

 

(10) Chlorine reacts under various conditions with sodium hydroxide to give

(A) Sodium Chloride (B) Sodium hypochlorite

(C) Sodium chlorate (D) All of these

 

(11) Br₂ gas turns starch iodide paper

(A) Blue (B) Red (C) Colourless (D) Yellow

 

(12) Which of following is weakest acid?

(A) HF (B) HCl (C) HBr (D) HI

 

(13) Deacon’s process is used in manufacture of

(A) Bleaching powder (B) Sulphonic acid (C) Nitric acid (D) Chlorine

 

(15) Which of following is correct?

(A) Iodine is solid (B) Chlorine is insoluble in water

(C) Iodine is more reactive than bromine (D) Bromine is more reactive than chlorine

 

(16) Sea water is employed as a source of manufacture of

(A) F (B) I (C) Br (D) Cl

 

(17) Which is most reactive halogen

(A) Cl₂ (B) Br₂ (C) I₂ (D) F₂

 

(18) Which of following represents clear electro positive properties

(A) F (B) Cl (C) Br (D) I

 

(19) Which of following represents outermost shell of halogens

(A) S²P³ (B) S²P⁶ (C) S²P⁴ (D) S²P⁵

 

(20) Most activeness of fluorine is due to

(A) F-F bond has less energy (B) F₂ is gas at normal temp

(C) Its e - affinity is max (D) None of above

 

(21) Which of following after reacting with KI do not remove Iodine

(A) CaSO₄ (B) K2Cr₂O₇ (C) HNO₃ (D) HCl

 

(22) Aqueous solution of which of following acid can not be kept in bottle of glass

(A) HF (B) HCl (C) HBr (D) HI

 

(23) Which of following pair is not correctly matched

(A) Halogen which is liquid at room temp. - Bromine

(B) Most electronegative element - Fluorine

(C) Most reactive halogen - Flouorine

(D) The Strorgest oxidizing halogen - Iodine

 

(24) Mark element that shows oxidation state only one

(A) F (B) Cl (C) Br (D) I

 

(25) Which of following has lowest boiling point

(A) HF (B) HCl (C) HBr (D) HI

 

(26) Fluorine is stronger oxidizing agent than chlorine in aqueous solution. This is attributed to many factors except.

(A) Heat of dissociation (B) e-affinity

(C) Heat of Hydration (D) Ionisation Potential

 

(27) Mark the element that displaces 3 halogens from their compound

(A) F (B) Cl (C) Br (D) I

 

(28) Mark smallest atom

(A) F (B) Cl (C) Br (D) I

 

(29) Which of following arrangement for 3 halogens Cl, Br, I when placed in order of increasing e-affinity

(A) Cl, Br, I (B) I, Br, Cl (C) Br, Cl , I (D) I , Cl , Br

 

(30) Fluorine is better oxidizing agent than Br₂ , It is due to

(A) small size of F. (B) More e - repulsion in F.

(C) More e– neg. in F. (D) Non - Metallic nature of F.

 

(31) Which statement is correct about halogens?

(A) They are all diatomic(B) They are forming universal solvents

(C) They can mutually displace each other from solution of their compound with metals.

(D) None of above

 

(32) Which of following is most basic?

(A) I (B) Br (C) Cl (D) F

 

(33) Which of following is not a green house gas?

(A) CO₂ (B) CH₄ (C) O₃ (D) N₂X

 

(34) Inisolation of F., a number of difficulties were encounted. Which statement is correct?

(A) Potential required for discharge of F. ions is the lowest.

(B) F. reacts with most glass vessel

(C) F has great affinity for H.

(D) Electrolysis of aqueous HF gives ozonised O₂

 

(35) Chlorin gas is dried over

(A) CaO (B) NaOH (C) KOH (D) Conc. H₂SO₄

 

(36) Chlorine is used in water for

(A) Killing germs (B) Prevention of pollution

(C) Cleansing (D) Removing dirt.

 

(37) Chlorine can not be used

(A) as bleaching agent (B) Sterilisation

(C) Preparation of antiseptic (D) Extraction of silver & copper

 

(38) Euchlorine is mixture of

(A) Cl₂ & SO₂ (B) Cl₂ & ClO₂ (C) Cl₂ & CO (D) None of these

 

(39) Which two salts are used in preparing iodised salt.

(A) KIO₃ & I₂ (B) KI & I₂ (C) KIO₃ & HI (D) HI & KI

 

(40) Which of following halogen oxides is ionic?

(A) ClO₂ (B) BrO₂ (C) I₂O₅ (D) I₄O₉

 

(41) Type of bonding in HCl is

(A) Pure Covalent (B) Polar Covalent (C) Highly Covalent (D) H - bonding

 

(42) Tincture of iodine is

(A) Aq. Sol. of I₂ (B) Solution of I₂ in Aq. KI

(C) alc. Sol. in I₂(D) Aq. Sol. of KI

 

(43) HBr & HI reduce Sulphuric acid, HCl can reduce KMnO₄ & HI can reduce

(A) H₂SO₄ (B) KMnO₄ (C) K₂Cr₂O₇ (D) None

 

(44) Hydrogen bonding is present in

(A) HF (B) HCl (C) HBr (D) HI

 

(45) Which one of following orders is not proper

(A) F₂ > Cl₂ > Br₂ > I₂ : Electronegativity

(B) ) F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy

(C) F₂ > Cl₂ > Br₂ > I₂ : Oxidising power

(D) HI > HBr > HCl > HF : Acidic property in water.

 

(46) Which of following chemicals contains chlorine?

(A) Fisc her salt (B) Epsom salt (C) Fremy's salt (D) Spirit of salt

 

(47) The halide NaF has high melting point than NaCl , NaBr, & NaI because

(A) Minimum ionic character (B) Maximum ionic character

(C) Highest oxidizing power (D) Lowest polarity

 

(48) Effective component of bleaching powder is -

(A) Cl (B) Br (C) Al (D) Ca

 

(49) Which of following is prepared by electrolytic method?

(A) Ca (B) Sn (C) S (D) F₂

 

(50) Chlorine dioxide is best prepared by passing dry

(A) Cl . gas over hot HgO (B) Cl & O₂ gas overhot pt . catalyst

(C) Chlorine over hot silver chromate (D) None of above

 

(51) Which one of following in aqueous solution gives a white precipitate with per chloric acid

(A) NaCl (B) KCl (C) MgCl₂ (D) FeCl₃

 

(52) NOCl is used as a bleaching agent & storilisng agent It can be synthesized by action of

(A) NaCl with H₂O (B) NH₄ Cl with NaOH

(C) Cl₂ with cold & dilute NaOH (D) Cl₂ with hot & Conc. NaOH

 

(53) A one litre flask is full of brown bromine vapour intensity of brown colour of vapour will not decrease a appriciable on adding to flask some of

(A) Pieces of marble (B) Carbon disulphide

(C) Carbon tetrachloride (D) Animal Charcoal Powder

 

(54) Which of following statement is correct?

(A) Only Cl & Br forms Oxyacids (B) all halogen form oxyacid

(C) All halogen except F. form oxyacid (D) Only iodine form oxyacid

 

(55) A mixture of ZnCl₂ & PbCl₂ can be separated by

(A) Distillation (B) Crystallization (C) Sublimation (D) adding aceticacid

 

(56) Hydrogen has a tendency to gain one e– to acquire helium configuration. In this respect it resembles.

(A) Halogens (B) Actinides (C) Transition metals (D) Alkali metals

 

(57) The compound added to table salt for maintaining proper health is

(A) KCl (B) KBr (C) NaI (D) MgBr₂

 

(58) Which of following halogen can be purified by sublimation?

(A) F₂ (B) Cl₂ (C) Br₂ (D) I₂

 

(59) Which statement is not true ?

(A) Ni(CO)₄ is diamagnetic

(B) BI₃ is strong Lewis acid than BF₃

(C) Graphite conducts electricity where as diamond does not

(D) CCl₄ is hydrolysed where as BCl3 is inert

 

(60) Bleaching Powder loser its power On keeping for long time because

(A) It changes to calcium hypochlorate

(B) It changes to calcium chloride & calicium hydroxide

(C) It absorbs moisture

(D) It changes to CaCl₂ & calcium chlorate.

 

(61) Compound that forms dative bond with ammonia

(A) CCl₄ (B) BCl₃ (C)MgCl₂ (D) NaCl

 

(62) Concentrated H₂SO₄ can not be used to prepare HBr from NaBr because it

(A) reduces HBr (B) Oxidises HBr (C) Reacts slowly (D) None of above

 

(63) When Fluoride is heated with conc. H₂SO₄ & MnO₂ the gas evolved is

(A) F2 (B) SF (C) HF (D) None

 

(64) Unlike other halogens Fluorine does not show higher oxidation states because

(A) It is highly electionegative (B) It has no d - orbital

(C) atomic radius is very small (D) None of Above

 

(65) Which of following molecule is theoratically not possible

(A) OF₄ (B) OF₂ (C) SF₄ (D) O₂F₂

 

(70) Which one of halogen acids is liquid ?

(A) HF (B) HCl (C) HBr (D) HI

 

(71) When Cl₂ is passed through hot & Conc. Solution of KOH following compound is formed.

(A) KCl (B) KClO₃ (C) KClO₂ (D) KClO₄

 

(72) Chlorine can remove

(A) Br from NaBr Sol. (B) F from NaF Sol.

(C) Cl from NaCl Sol. (D) F from CaF₂ Sol.

 

(73) Which one of following acid is weakest?

(A) HClO (B) HBr (C) HClO₃ (D) HCl

 

(74) Which of following will displace halogen from solution of halide?

(A) Br₂ added to NaCl (B) Cl₂ added to KCl

(C) KCl added to NaF (D) Br₂ added to KI

 

(75) Chlorine can be manufactured from

(A) Electrolysis of NaCl (B) Electrolysis of brine

(C) Electrolysis of bleaching powder (D) All above

 

(76) Nitric acid converts iodine to

(A) Iodic acid (B) Hydro iodic acid

(C) Iodine Nitrate (D) Iodine pentoxide

 

(77) In preparation of chlorine from HCl, MnO₂ acts as

(A) Oxidising agent (B) Reducing agent

(C) Catalytic agent (D) Dehydration agent

 

(83) Which one is anhydride of HClO₄

(A) Cl₂O (B) ClO₂ (C) Cl₂O₆ (D) Cl₂O₇

 

(84) In dark, which of following reacts with Hydrogen?

(A) Br₂ (B) F₂ (C) I₂ (D) Cl₂

 

(85) Electrolysis of a liquid resulted in formation of Hydrogen at cathode & Cl₂ at anode. Liquid is

(A) Pure water (B) H₂SO₄ Solution (C) NaCl Solution (D) CaCl₂ Solution

 

(86) Concentrated HNO₃ reacts with I₂ to give

(A) HI (B) HOI (C) HOIO₂ (D) HOIO₃

 

(87) Manufacture of Bromine from sea water, the mother liquor containing bromides is treated with

(A) CO₂ (B) CI₂ (C) I₂ (D) SO₂

 

(88) Formula of some fluorides are given. Which of them will combine with fluorine?

(A) IF₅ (B) NaF (C) CaF₂ (D) SF₅

 

(89) Which of following oxidizes H₂O to oxygen.

(A) Cl (B) F (C) Br (D) I

 

(90) A solution of HCl in water is good conductor while gaseous Hydrogen chloride is not .

This is because

(A) Water is good conductor of electricity (B) HCl in water ionises

(C) Gas can not conduct electricity but water can (D) None of these

 

(91) Bleaching action of bleaching powder is due to liberation of

(A) Chlorine (B) Molecular oxygen

(C) Nascent oxygen (D) Calcium carbonate

 

(92) What products are expected from disproportion reaction of hypochlorous acid.

(A) HClO₃ & Cl₂O (B) HClO₂ & HClO₄

(C) HCl & Cl₂O (D) HCl & HClO₃

 

(93) Mixture of conc. HCl & HNO₃ made in 3:1 ratio contains

(A) ClO₂ (B) NOCl (C) NCl₃ (D) N₂O₄

 

(94) I–|3| is used for treatment of

(A) Thyroid disorders (B) Skin disorders (C) Brain tumours (D) Kidney stones

 

(95) Least reactive halogen with hydrogen is

(A) Cl (B) I (C) Br (D) F

 

(96) Bleaching action of chlorine is due to

(A) Oxidation (B) Reduction (C) Hydrolysis (D) Its acidic nature

 

(97) Which among following non metals is liq at 25°C

(A) Br (B) C (C) P (D) S.

 

(98) Element that librates oxygen gas from water is

(A) P (B) Na (C) F (D) I.

 

(99) On exciting Cl₂ molecule by UV Light , we get

(A) Cl (B) Cl⁺ (C) Cl^– (D) All

 

(100) Which of following sequence is correct with refrence to oxidation number of iodine

(A) I₂ < ICl < HI < HIO₄ (B) HIO₄ < ICl <  I₂ < HI

(C)  I₂ < HI < ICl < HIO₄. (D) HI <  I₂ < IC < HIO₄

 

(101) What is obtained on reacting HgCl₂ & Hg(CN)₂.

(A) (CN)₂. (B) addition compound HgCl₂. Hg(CN)₂

(C) Hg(CN) Cl (D) Hg [Hg(CN)₂Cl₂]

 

(102) Chlorine is liberated when we heat

(A) KMnO₄ + NaCl (B) K₂ Cr₂O₇ + MnO₂

(C) ) Pb₂ (NO₃)₄ + MnO₂ (D) K₂ Cr₂O₇ + HCl

 

(103) Metal halide, insoluble in water is

(A) AgI (B) KBr (C) CaCl₂ (D) AgF

 

(104) Which of following oxides is expected exhibit paramagnetic behaviour

(A) CO₂ (B) SO₂ (C) ClO₂ (D) SiO₂

 

(105) Iodine dissolver readily in

(A) Water (B) Potassium iodide (C) CCl₄ (D) Alcohol

 

(106) Cl₂ reacts with CS₂ in presence of I₂ to form

(A) CHCl₃ (B) CCl₄ (C) C₂H₅Cl (D) C₂H₆

 

(107) Bleaching powder is

(A) CaOCl₂ (B) CaO (C) CaO(Cl). (D) CaCl(OCl)

 

(108) Bleaching powder is obtained by treating chlorine with

(A) CaO (B) CaCO₃ (C) CaSO₄ (D) Ca(OH)₂

 

(109) Which is formed when F reacts with hot & conc. Sodium Hydroxide.

(A) O₂ (B) O₃ (C) NaO (D) HF.

 

(110) Bromine water reacts with SO₂ to form

(A) H₂O & HBr (B) H₂SO₄ & HBr (C) HBr & S (D) S & H₂O

 

(111) On heating NaCl + K₂ Cr₂O₇ + Conc. H₂SO₄, we get

(A) O₂ (B) Cl₂ (C) CrOCl₂ (D) CrO₂Cl₂

 

(112) Amongst LiCl , RbCl , BeCl₂ & MgCl₂ , max. & min. ionic character will be shown by

(A) LiCl , MgCl₂. (B) RbCl , BeCl₂ (C) RbCl , MgCl₂ (D) MgCl₂,BeCl₂

 

(113) Which of following chloride is water insoluble

(A) HCl (B) AgCl (C) both 'a' & b (D) None

 

(114) The alkali metal halide are soluble in water but LiF is insoluble because

(A) It's Amphoteric (B) Li -F is highly ionic

(C) It's Lattice energy is high (D) Li⁺ ion is least hydrated.

 

(115) Which of following is present as an active ingredient in bleaching powder for bleaching action

(A) CaCl₂ (B) CaOCl₂ (C) Ca(OCl)₂ (D) CaO₂Cl

 

(116) ClO₂ reacts with O₃ to give

(A) Cl₂O₄ (B) Cl₂O (C) Cl₂O₆ (D) ClO₄

 

(117) Bad conductor Of electricity is

(A) H₂F₂ (B) HCl (C) HBr (D) HI

 

(118) When KBr is treated with concentrated H₂SO₄ redish brown gas evolved, gas is

(A) Mixture of Br & HBr (B) Bromine & HNO₃

(C) Bromine (D) None of these.

 

 

 

 

M.C.Q.

NOBLE GASES FAMILY

 

(1) Which of following outter electronic configuration represents Ar?

(A) ns² (B) ns² np⁶ (C) ns² np⁵ (D) ns² np⁴

 

(2) Which mineral was used in isolation of radium?

(A) Lime stone (B) Pitch blende (C) Rectile (D) Haematite

 

(3) Molecules of noble gas do not posses vibrational energy bec. Noble gas is

(A) Monoatomic (B) Chemically inert

(C) Complete filled shells (D) Is diatomic

 

(4) Argon was discovered by

(A) Rayleigh (B) Frankland & Lockyer (C) Jansen (D) Ramsay

 

(5) The colour discharge tubes for advertisement mainly contain

(A) Argon. (B) Neon (C) Helium (D) Xenon

 

(6) Least chemical activity is shown by

(A) Nitrogen. (B) Argon (C) Methane (D) Xenon

 

(7) Noble gases do not react with other elements because

(A) They have completely paired up & stable e - configuration

(B) Their size is very small

(C) Are monoatomic

(D) None of these

 

(8) Monazite is source of

(A) He (B) Kr (C) Ar (D) Ne.

 

(9) He is added to oxygen supply used by deep sea divers because

(A) It's less soluble in blood than Nitrogen at high pressure

(B) It is Lighter than Nitrogen

(C) It is readily miscible in oxygen

(D) It is less poisionous than Nitrogen

 

(10) Which of following is not correct for noblegas?

(A) Ar is used in electric bulbs

(B) Kr is obtained during radioactive disintegration

(C) Half life of Rn is 3.8 days

(D) He is used to produce Low temp.

 

(11) Which of following represents noble gas configuration.

(A) 1S², 2S² 2P⁶, 3S² 3P⁵ (B) 1S², 2S² 2P⁶, 3S² 3P⁶

(C) 1S², 2S² 2P⁶ (D) 1S² , 2S²

 

(12) Which of following has zero valency

(A) Sodium (B) Beryllium (C) Aluminium . (D) Krypton.

 

(13) The forces acting between noble gas atoms are

(A) Vander waals forces (B) Ion - dipole forces

(C) London - dispersion forces (D) Magnatic forces

 

(14) Which of following is correct sequence of noble gas in their group ?

(A) Ar, He, Kr , Ne , Xe, Rn (B) He, Ar, Ne, Kr, Xe, Rn

(C) He, Ne, Ar, Kr, Xe, Rn (D) He, Ne, Kr, Ar, Xe, Rn

 

(15) Which of following is noble gas configuration?

(A) 1s² (B) 1S², 2S²

(C) 1S², 2S² 2P⁶, 3S¹ (D) 1S², 2S² 2P⁶, 3S², 3P⁶, 4S²

 

(16) Which of following noble gas does not have octate of e - in outer most shell.

(A) Ne (B) Rn (C) Ar (D) He

 

(17) Low chemical reactivity of rate gases can be attributed to their

(A) Being nonmetal (B) Having High ioni cation energies

(C) Being gases (D) Found in nature in small quantities.

 

(18) % of Ar in air is;

(A) 1% (B) 2% (C) 3% (D) 4%

 

(19) F. forms chemical compound with

(A) He (B) Ne (C) Ar . (D) Xe.

 

(21) Last member of inert gas element is

(A) Ne (B) He (C) Ar. (D) Rn

 

(22) Which of following is inert gas

(A) H₂ (B) O₂ (C) N₂. (D) Argon.

 

(23) Which inert gas show abnormal behavior on liquefaction

(A) Xe (B) He (C) Ar (D) Kr

 

(24) Inert gas producing max. number of compounds

(A) He & Ne (B) Ar & Ne (C) Kr & Ne (D) Ar & Xe

 

(25) Helium was discovered by

(A) Crooks (B) Rutherford

(C) Frankland & Lockyer (D) Dorn

 

(26) XeF₄ & XeF₆ are expected to be

(A) Oxidising (B) Reducing (C) Un reactive (D) Strongly basic

 

(27) Noble gas forms max. No. of compounds is

(A) Ar (B) He (C) Xe (D) Ne

 

(28) Nuclear Fusion Produces

(A) Ar (B) Duterium . (C) He (D) Krypton

 

(29) Among fluorides, one that does not exists is

(A) XeF₄. (B) HeF₄ (C) SF₄ (D) CF₄

 

(30) Last orbit of argon would have ___ e-

(A) 6 (B) 2 (C) 18 (D) 8

 

(31) Electronic configuration of neon is

(A) 1S², 2S² 2P² (B) 1S², 2S² 2P⁶ (C) 1S², 2S² (D) 1S²

 

(32) Which of following noble gas s is least polarizable

(A) Xe (B) Ar (C) Ne (D) He

 

(33) XeF₆ on hydrolysis gives

(A) XeO₃ (B) XeO (C) XeO₂ (D) Xe