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MCQ for Full Syllabus Chemistry The P Block Elements
Full Syllabus Chemistry students should refer to the following multiple-choice questions with answers for The P Block Elements in Full Syllabus.
The P Block Elements MCQ Questions Full Syllabus Chemistry with Answers
Question: Ionic radii (in Å) of As3+, Sb3+ and Bi3+ follow the order
- a) Bi3+ > Sb3+ > As3+
- b) Sb3+ > Bi3+ >As3+
- c) As3+ > Sb3+ > Bi3+
- d) None of these
Answer: Bi3+ > Sb3+ > As3+
Question: Which of the following statements is not correct for nitrogen?
- a) d-orbitals are available for bonding
- b) Its electronegativity is very high
- c) It is a typical non-metal
- d) Its molecular size is small
Answer: d-orbitals are available for bonding
Question: Collectively the elements of group 15 are called
- a) pnicogens
- b) nicopen
- c) pnicopens
- d) None of these
Answer: pnicogens
Question: Which one of the following elements is most metallic
- a) Bi
- b) As
- c) P
- d) Sb
Answer: Bi
Question: Which of the following statement is incorrect for group 15 elements ?
- a) The boiling point and melting point increases from top to bottom in the group
- b) Dinitrogen is a gas while all others are solids
- c) All statements are correct
- d)
Answer: The boiling point and melting point increases from top to bottom in the group
Question: Which of the follow group 15 element forms metallic bonds in elemental state ?
- a) Bi
- b) P
- c) As
- d) Sb
Answer: Bi
Question: The three important oxidation states of phosphorus are
- a) –3, +3 and +5
- b) –3, +3 and +2
- c) –3, +3 and –5
- d) –3, +3 and +4
Answer: –3, +3 and +5
Question: Nitrogen is relatively inactive element because
- a) dissociation energy of its molecule is fairly high
- b) its electronegativity is fairly high
- c) it has low atomic radius
- d) its atom has a stable electronic configuration
Answer: dissociation energy of its molecule is fairly high
Question:
- a) N
- b) As
- c) P
- d) Sb
Answer: N
Question: Pick out the wrong statement.
- a) Catenation tendency is higher in nitrogen when compared with other elements of the same group
- b) Nitrogen has higher first ionisation enthalpy whencompared with other elements of the same group.
- c) Bismuth forms metallic bonds in elemental state
- d) None of these
Answer: Catenation tendency is higher in nitrogen when compared with other elements of the same group
Question: Nitrogen forms N2, but phosphorus is converted into P4 from P, the reason is
- a)
- b)
- c) Multiple bond is formed easily
- d) Triple bond is present between phosphorus atom
Answer:
Question: What causes nitrogen to be chemically inert ?
- a) High bond energy
- b) None of these
- c) Absence of bond polarity
- d) Multiple bond formation in the molecule
Answer: High bond energy
Question: Among the 15th group elements, as we move from nitrogen to bismuth, the pentavalency becomes less pronounced and trivalency becomes more pronounced due to
- a) Inert pair effect
- b) Large ionization energy
- c) Non metallic character
- d) High electronegativity
Answer: Inert pair effect
Question: Pentavalence in phosphorus is more stable when compared to that of nitrogen even though they belong to same group. This is due to
- a) due to presence of vacant d-orbitals
- b) reactivity of phosphorus
- c) inert nature of nitrogen
- d) dissimilar electronic configuration
Answer: due to presence of vacant d-orbitals
Question: Which one has the lowest boiling point ?
- a) PH3
- b) SbH3
- c) NH3
- d) AsH3
Answer: PH3
Question: Most acidic oxide among the following is
- a) N2O5
- b) N2O4
- c) P2O5
- d) As2O3
Answer: N2O5
Question: Which of the following species has the highest dipole moment
- a) NH3
- b) PH3
- c) SbH3
- d) None of these
Answer: NH3
Question: The correct decreasing order of basic strength is
- a)
- b)
- c)
- d) None of these
Answer:
Question: Which of the following fluorides does not exist?
- a) NF5
- b) AsF5
- c) SbF5
- d) PF5
Answer: NF5
Question: The p-block element of group 15 that forms predominantly basic oxide is
- a) Bi
- b) P
- c) N
- d) As
Answer: Bi
Question: With respect to protonic acids, which of the following statements is correct
- a) PH3 is less basic than NH3
- b) PH3 is more basic than NH3
- c) PH3 is equally basic as NH3
- d) PH3 is amphoteric while NH3 is basic
Answer: PH3 is less basic than NH3
Question: PCl5 is possible but NCl5 does not exist
- a) in N, d-sub-shell is absent
- b) ionization energy of N is very high
- c) it does not like Cl
- d) None of these
Answer: in N, d-sub-shell is absent
Question: Maximum covalency of nitrogen is
- a) 4
- b) 3
- c) 5
- d) 6
Answer: 4
Question: Elements of group-15 form compounds in +5 oxidation state. However, bismuth forms only one well characterised compound in +5 oxidation state. The compound is
- a) BiF5
- b) Bi2S5
- c) BiCl5
- d) None of these
Answer: BiF5
Question: Pure nitrogen is prepared in the laboratory by heating a mixture of
- a) NH4Cl + NaNO2
- b) NH4NO3 + NaCl
- c) NH4OH + NaCl
- d) NH4Cl + NaOH
Answer: NH4Cl + NaNO2
Question: On heating ammonium dichromate and barium azide separately we get
- a) N2 in both cases
- b) N2 with ammonium dichromate and NO with barium azide
- c) N2O with ammonium dichromate and N2 with barium azide
- d) None of these
Answer: N2 in both cases
Question: In Haber’s process for the manufacture of NH3
- a) finely divided nickel is used as a catalyst
- b) finely divided iron is used as a catalyst
- c) finely divided molybdenum is used as a catalyst
- d) no catalyst is necessary
Answer: finely divided nickel is used as a catalyst
Question: Ammonia on reaction with hypochlorite anion can form
- a) Both
- b) N2H4
- c) NH4Cl
- d) None of these
Answer: Both
Question: NH3 gas is dried over
- a) CaO
- b) HNO3
- c) CuSO4
- d) P2O5
Answer: CaO
Question: The shape of ammonia molecule is
- a) pyramidal
- b) octahedral
- c) tetrahedral
- d) planar triangle
Answer: pyramidal
More Questions................................................
Question: One mole of calcium phosphide on reaction with excess water gives
- a) two moles of phosphine
- b) one mole of phosphorus pentoxide
- c) two moles of phosphoric acid
- d) one mole of phosphine
Answer: two moles of phosphine
Question: PH3, the hydride of phosphorus is
- a) covalent
- b) ionic
- c) metallic
- d) non-metallic
Answer: covalent
Question: Phosphine is not obtained by which of the following reaction
- a) Red P is heated with NaOH
- b) White P is heated with NaOH
- c) Phosphorus trioxide is boiled with water
- d) Ca3P2 reacts with water
Answer: Red P is heated with NaOH
Question: Phosphine is not evolved when
- a) metaphosphoric acid is heated
- b) calcium hypophosphite is heated
- c) phosphorus acid is heated
- d) white phosphorus is boiled with a strong solution of Ba(OH)2
Answer: metaphosphoric acid is heated
Question: Pure phosphine is not combustible while impure phosphine is combustible, this combustibility is due to presence of
- a) P2H4
- b) N2
- c) PH5
- d) P2O5
Answer: P2H4
Question: When orthophosphoric acid is heated to 600°C, the product formed is
- a) HPO3
- b) P2O5
- c) PH3
Answer: HPO3
Question: P2O5 is heated with water to give
- a) orthophosphoric acid
- b) phosphorous acid
- c) hypophosphoric acid
- d) hypophosphorous acid
Answer: orthophosphoric acid
Question: Basicity of orthophosphoric acid is
- a) 3
- b) 5
- c) 2
- d) 4
Answer: 3
Question: PCl3 reacts with water to form
- a) H3PO4 and HCl
- b) H3PO4
- c) PH3
- d) POCl3
Answer: H3PO4 and HCl
Question: H3PO2 is the molecular formula of an acid of phosphorus. Its name and basicity respectively are
- a) hypophosphorous acid and one
- b) hypophosphoric acid and two
- c) hypophosphorous acid and two
- d) phosphorus acid and two
Answer: hypophosphorous acid and one
Question: The structural formula of hypophosphorous acid is
- a)
- b)
- c)
- d)
Answer:
Question: Number of sigma bonds in P4O10 is
- a) 16
- b) 7
- c) 6
- d) 17
Answer: 16
Question: The number of hydrogen atom(s) attached to phosphorus atom in hypophosphorous acid is
- a) two
- b) three
- c) one
- d) zero
Answer: two
Question: The number of P – O – P bonds in cyclic metaphosphoric acid is
- a) three
- b) zero
- c) two
- d) four
Answer: three
Question: Oxidation states of P in H4P2O5 , H4P2O6 , and H4P2O7 , are respectively:
- a) + 3, + 4, + 5
- b) + 5, + 3, + 4
- c) + 3, + 5, + 4
- d) + 5, + 4, + 3
Answer: + 3, + 4, + 5
Question: How many bridging oxygen atoms are present in P4O10?
- a) 6
- b) 2
- c) 5
- d) 4
Answer: 6
Question: Which of the following statements is not valid for oxoacids of phosphorus?
- a) Hypophosphorous acid is a diprotic acid
- b) Orthophosphoric acid is used in the manufacture of triple superphosphate
- c) All oxoacids contain tetrahedral four coordinated phosphorus
- d) All oxoacids contain atleast one P = O and one P — OH group
Answer: Hypophosphorous acid is a diprotic acid
Question: What is hybridization of P in PCl5 ?
- a) sp3d
- b) sp3
- c) sp2
- d) None of these
Answer: sp3d
Question: Which of the following is a cyclic phosphate ?
- a) H5P5O15
- b) H3P3O10
- c) H6P4O13
- d) None of these
Answer: H5P5O15
Question: P—O—P bond is present in
- a) Both
- b)
- c)
- d) None of these
Answer: Both
Question: Orthophosphoric acid is
- a) tribasic
- b) monobasic
- c) dibasic
- d) tetrabasic
Answer: tribasic
Question: The oxyacid of phosphorous in which phosphorous has the lowest oxidation state is
- a) hypophosphorous acid
- b) orthophosphoric acid
- c) pyrophosphoric acid
- d) None of these
Answer: hypophosphorous acid
Question: The number of P—O—P bonds in cyclic metaphosphoric acid is
- a) three
- b) zero
- c) two
- d) four
Answer: three
Question: Among the oxyacids of phosphorus, the dibasic acid is
- a) H3PO3
- b) HPO3
- c) H3PO2
- d) None of these
Answer: H3PO3
Question: The basicity of pyrophosphorus acid is
- a) 2
- b) 1
- c) 4
- d) 5
Answer: 2
Question: The oxidation state of phosphorus in cyclotrimetaphosphoric acid is
- a) +5
- b) +2
- c) +3
- d) –3
Answer: +5
Question: Which acid has P – P linkage
- a) Hypophosphoric acid
- b) Metaphosphoric acid
- c) Pyrophosphoric acid
- d) Orthophosphoric acid
Answer: Hypophosphoric acid
Question: In a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present?
- a) 3 double bonds; 9 single bonds
- b) 6 double bonds; 6 single bonds
- c) 3 double bonds; 12 single bonds
- d) Zero double bonds; 12 single bonds
Answer: 3 double bonds; 9 single bonds
Question: Strong reducing behaviour of H3PO2 is due to
- a) Presence of one –OH group and two P–H bonds
- b) High electron gain enthalpy of phosphorus
- c) Presence of two –OH groups and one P–H bond
- d) Low oxidation state of phosphorus
Answer: Presence of one –OH group and two P–H bonds
Question: In solid state PCl5 is a
- a)
- b)
- c) octahedral structure
- d) covalent solid
Answer:
Question: Electron affinity of sulphur is
- a) more than O and Se
- b) more than O but less than Se
- c) less than O but more than Se
- d) equal to O and Se
Answer: more than O and Se
Question: All the elements of oxygen family are
- a) polymorphic
- b) metalloids
- c) non metals
- d) radioactive
Answer: polymorphic
Question: Which shows maximum catenation property ?
- a) S
- b) Te
- c) Se
- d) O
Answer: S
Question: Oxygen and sulphur both are the members of the same group in periodic table but H2O is liquid while H2S is gas because
- a) water molecules are having weak hydrogen bonds between them
- b) H2S is weak acid
- c) electronegativity of sulphur is more
- d) molecular weight of water is more
Answer: water molecules are having weak hydrogen bonds between them
Question: Which of the following hydrides has the lowest boiling point
- a) H2S
- b) H2Te
- c) H2O
- d) None of these
Answer: H2S
Question: Which of the following hydrides is most acidic ?
- a) H2Te
- b) H2O
- c) H2S
- d) H2Se
Answer: H2Te
Question: Which of the following hydrides shows the highest boiling point ?
- a) H2O
- b) H2S
- c) H2Se
- d) None of these
Answer: H2O
Question: Which is the best oxidising agent among the following ?
- a) O
- b) Te
- c) S
- d) Se
Answer: O
Question: Which of the following oxide is amphoteric
- a) SnO2
- b) CaO
- c) CO2
- d) SiO2
Answer: SnO2
Question: Which of the following is not correctly matched
- a) SF6 – solid
- b) SeF4 – liquid
- c) SF4 – gas
- d) None of these
Answer: SF6 – solid
Question: The compound which gives off oxygen on moderate heating is
- a) mercuric oxide
- b) aluminium oxide
- c) cupric oxide
- d) zinc oxide
Answer: mercuric oxide
Question: Oxygen molecule is
- a) paramagnetic with two unpaired electrons
- b) paramagnetic with no unpaired electron(s)
- c) diamagnetic with two unpaired electrons
- d) diamagnetic with no-unpaired electron(s)
Answer: paramagnetic with two unpaired electrons
Question: The number of electrons that are paired in oxygen molecule are
- a) 14
- b) 16
- c) 12
- d) 7
Answer: 14
Question: On heating KClO3 we get
- a) KCl + O2
- b) KCl + O2 + O3
- c) KCl + O3
- d) None of these
Answer: KCl + O2
Question: About 20 km above the earth, there is an ozone layer. Which one of the following statements about ozone and ozone layer is true?
- a) It is beneficial to us as it stops U.V radiation
- b) It is harmful as it stops useful radiation
- c) Ozone has a triatomic linear molecule
- d) Conversion of O3 to O2 is an endothermic reaction
Answer: It is beneficial to us as it stops U.V radiation
Question: Oxygen gas can be prepared from solid KMnO4 by
- a) strongly heating the solid
- b) treating the solid with H2 gas
- c) dissolving the solid in dil. H2SO4
- d) dissolving solid in dil. HCl
Answer: strongly heating the solid
Question: Which of the following statements is correct
- a) Ozone is an allotropic modification of oxygen
- b) Ozone has no relationship with oxygen
- c) Ozone is an isomer of oxygen
- d) Ozone is a resonance hybrid of oxygen
Answer: Ozone is an allotropic modification of oxygen
Question: Which of the following on thermal decomposition gives oxygen gas ?
- a) All of these
- b) Pb3O4
- c) Ag2O
- d) PbO2
Answer: All of these
Question: Which of the following is an acidic oxide?
- a) Mn2O7
- b) N2O
- c) BaO
- d) Na2O
Answer: Mn2O7
Question: Atomicity of sulphur in rhombic sulphur is
- a) 8
- b) 1
- c) 2
- d) 6
Answer: 8
Question: Which of the following is not oxidized by O3 ?
- a) KMnO4
- b) KI
- c) FeSO4
- d) None of these
Answer: KMnO4
Question: Which of the following form of the sulphur shows paramagnetic behaviour
- a) S2
- b) S8
- c) S6
- d) All of these
Answer: S2
Question:
- a) V2O5
- b) CuO
- c) MnO2
- d) None of these
Answer: V2O5
Question: Which of the following oxo acid of sulphur has O–O bond
- a) H2S2O8
- b) H2S2O5
- c) H2S2O7
- d) None of these
Answer: H2S2O8
Question: Carbohydrates on reaction with conc. H2SO4 becomes charred due to
- a) dehydration
- b) oxidation
- c) hydrolysis
- d) hydration
Answer: dehydration
Question: Which of the following is the key step in the manufacture of sulphuric acid ?
- a) Conversion of SO2 to SO3 by the reaction with oxygen in presence of catalyst
- b) Burning of sulphur or sulphide ores in air to generate SO2
- c) Absorption of SO3 in H2SO4 to give oleum
- d) None of these
Answer: Conversion of SO2 to SO3 by the reaction with oxygen in presence of catalyst
Question: Hybridization of S in SO3 is
- a) sp2
- b) sp3
- c) sp2d
- d) None of these
Answer: sp2
Question: By which of the following SO2 is formed
- a) Reaction of conc. H2SO4 with Cu
- b) None of these
- c) Hydrolysis of dil. H2SO4
- d) Reaction of dil. H2SO4 with O2
Answer: Reaction of conc. H2SO4 with Cu
Question: Number of bonds in SO2 are
- a)
- b)
- c)
- d) None of these
Answer:
Question: Bleaching action of SO2 is due to its
- a) reducing property
- b) oxidising property
- c) acidic property
- d) basic property
Answer: reducing property
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MCQs for The P Block Elements Chemistry Full Syllabus
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