CBSE Class 10 Science Metals and Non metals VBQs

The graph below show the rate of reaction of three different metals X, Y and Z with dilute sulphuric acid. 

Question. Which of the following is represented by ‘Y’?
(a) Al
(b) Mg
(c) Zn
(d) can’t be predicted.

Answer : A

Question. Which of the following will represent Z?
(a) Al
(b) Mg
(c) Fe
(d) Can’t be predicted

Answer : C

Question. In which of the following cases, hydrogen gas is not evolved?
(a) Mg react with dil. H₂SO₄
(b) Zn react with dil. HNO₃
(c) Mg react with dil. HNO₃
(d) Mn react with dil. HNO3

Answer : B

Question. What will be observed if Mg ribbon is placed in CuSO₄ solution?
(a) Solution turns blue
(b) Solution turns colourless
(c) Solutions turns green
(d) Solution turns red

Answer : B

Question. Which one will be represented by ‘X’
(a) Na
(b) Mg
(c) Al
(d) Zn

Answer : A

The table shows the reaction of different metals with water. 

Question. Which metal can displace ‘G’ from its salt solution?
(a) E
(b) F
(c) H
(d) Both F and H

Answer : D

Question. Which metal is likely to be displaced by ‘G’?
(a) E
(b) F
(c) G
(d) H

Answer : A

Question. Identify the correct order of reactivity of metals.
(a) E < F < G < H
(b) E < G < F < H
(c) E < G < H < F
(d) H < G < F < E

Answer : B

Question. Which of the following metal reacts with water vigorously?
(a) Cu
(b) Mn
(c) Na
(d) Al

Answer : C

Question. When oxide of metal H reacts with water the solution formed is
(a) Basic
(b) Acidic
(c) Neutral
(d) May be basic or acidic

Answer : A

Question. An element reacts with oxygen to give a compound with a high melting point. This compound is soluble in water. The element is likely to be-
(a) calcium
(b) carbon
(c) silicon
(d) iron

Answer : A

Question. The metal that reacts with cold water is-
(a) mercury
(b) sodium
(c) zinc
(d) tungsten

Answer : B

Question. Aluminium does not oxidise readily in air because-
(a) it is high in the electrochemical series
(b) it is low in the electrochemical series
(c) the metal does not combine with oxygen
(d) the metal is covered with a layer of oxide which does not rub off

Answer : D

Question. Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
(a) Brass
(b) Bronze
(c) Amalgam
(d) Steel

Answer : D

Question. Which of the following is a characteristic of metals?
(a) They have one to three valence electrons
(b) They have 4 to 8 valence electrons
(c) They are brittle
(d) They are capable to form anions easily

Answer : A

Question. The correct order of increasing chemical reactivity is-
(a) Zn(b) Fe(c) Fe(d) Fe

Answer : D

Question. The best malleable metal is-
(a) aluminium
(b) silver
(c) gold
(d) lead

Answer : C

Question. A reactive metal (M) is treated with H₂SO₄(dil). The gas is evolved and is collected over the water as shown in the figure.

The correct conclusion drawn is/are
(a) the gas is hydrogen
(b) the gas is lighter than air
(c) the gas is SO₂ and is lighter than air
(d) Both (a) and (b)

Answer : D

Question. Silicon is used in
(a) solar energy devices
(b) semiconductors
(c) transistors
(d) all of these

Answer : D

Question. Silver articles become black on prolonged exposure to air. This is due to the formation of
(a) Ag₃N
(b) Ag₃O
(c) Ag₃S
(d) Ag₃S and Ag₃N

Answer : C

Question. Zn + H₂O(Steam) → A + B , In the equation A and B are^-
(a) Zn, H only
(b) ZnH₂ and O₂
(c) ZnH₂ and O₂
(d) ZnO& H₂

Answer : D

Question. On the basis of the sequence of the given reactions identify the most and least reactive elements:
X + YA → XA + Y ...(1)
X + YB → XB + Y ...(2)
Z + XA → ZA + X ...(3)
(a) X and Z
(b) Y and Z
(c) Z and X
(d) Z and Y

Answer : D

Question. Which of the following only contain non-metals?
(a) Carbohydrates
(b) Proteins
(c) Alloys
(d) Both (a) and (b)

Answer : D

Question. The composition of aqua-regia is
(a) Dil.HCl : Conc. HNO₃ :: 3 : 1
(b) Conc. HCl : Dil. HNO₃ :: 3 : 1
(c) Conc. HCl : Conc. HNO₃ :: 3 : 1
(d) Dil.HCl : Dil. HNO₃ :: 3 : 1

Answer : C

Question. In each test tubes A,B,C and D, 2mL of solution of Al₂(SO₄)₃ in water was filled. Clean pieces of zinc was placed in test tube A, clean iron nail was put in test tube B, silver (Ag) was placed in test tube C and a clean copper wire was placed in test tube D. Which of the following option (s) is/are correct about above experiment?
(a) Zinc is more reactive than aluminium
(b) Copper is more reactive than aluminium
(c) Zinc is more reactive than copper
(d) Zinc, iron, silver and copper are less reactive than aluminium

Answer : D

Question. Removal of impurities from ore is known as-
(a) crushing and grinding
(b) concentration of ore
(c) calcination
(d) roasting

Answer : B

Question. When iron filings are heated in a steam of dry hydrogen chloride, the compound formed is FeCl_x where x is-
(a) 1
(b) 2
(c) 3
(d) 4

Answer : B

Question. Food cans are coated with tin and not with zinc because
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.
(c) zinc is more reactive than tin.
(d) zinc is less reactive than tin.

Answer : C

Question. The only metal that is liquid at room temperature is-
(a) mercury
(b) sodium
(c) zinc
(d) tungsten

Answer : A

Question. A metal M has electronic configuration 2, 8, 3 and occurs in earth’s crust and its oxide M₂O₃ . It is more reactive than zinc. Which of the following options (s) is/are correct?
(a) The metal M is iron
(b) The metal M is lead
(c) The ore form which metal M is extracted in haematite.
(d) The ore form which metal M is extracted is bauxite.

Answer : D

Question. Which of the following is not a property of non-metals?
(a) They are neither malleable nor ductile
(b) They are brittle
(c) They are sonorous
(d) They are poor conductor of heat and electricity (except graphite)

Answer : C

Question. Which of the following metal has highest melting point?
(a) Copper
(b) Silver
(c) Sodium
(d) Tungsten

Answer : D

Question. Metal M reacts with oxygen to form metallic oxide MO. This oxide reacts with moisture and carbon dioxide of the atmosphere to form a basic carbonate metal M. The metal ‘M’ is
(a) Cu
(b) Fe
(c) Zn
(d) Cr

Answer : A

Question. An alloy is
(a) an element
(b) a compound
(c) a homogeneous mixture
(d) a heterogeneous mixture

Answer : C

Question. Which of the following metal will not give H₂(g) with H₂O?
(a) Na(s) + 2H₂O →
(b) Mg(s) + 2H₂O →
(c) Zn(s) + H₂O →
(d) Cu + H₂O →

Answer : D

Question. Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a) applying grease
(b) applying paint
(c) applying a coating of zinc
(d) all of the above.

Answer : C

Question. Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of
(a) gallium
(b) aluminium
(c) zinc
(d) silver

Answer : C

Question. E is an element that’s ore is rich in E₂O₃ • E₂O₃ is not affected by water. It forms two chlorides, ECl₂ and ECl₃ . The element E is
(a) copper
(b) zinc
(c) aluminium
(d) iron

Answer : D

Question. A student mistakenly used a wet gas jar to collect sulphur dioxide. Which one of the following tests of the gas is likely to fail?
(a) Odour
(b) Effect on acidified K₂Cr₂O₇ solution
(c) Solubility test
(d) None of these

Answer : D

Question. Heating of concentrated ore in absence of air for conversion into oxide ore is known as-
(a) roasting
(b) calcination
(c) reduction
(d) none of these

Answer : B

Question. Which of teh following reactions not occur?
(a) 2AgNO₃(aq) + Zn(s) → Zn(NO₃)₂(aq) + 2Ag(s)
(b) CuSO₄(aq) + Zn(s) → ZnSO₄(aq) + Cu(s) 
(c) 2AgNO₃(aq) + Fe(s) → Fe(NO₃)₂(aq) + 2Ag(s) 
(d) CuSO₄(aq) + 2Ag(s) → Cu(s) + Ag2SO₄(aq) 

Answer : D

Question. What is anode mud?
(a) fan of anode
(b) metal of anode
(c) impurities collected at anode in electrolysis during purification of metals
(d) all of these

Answer : C

Question. When a metal is added to dilute HCl solution, there is no evolution of gas. Metal is-
(a) K
(b) Na
(c) Ag
(d) Zn

Answer : C

Question. Which of the following is not a characteristics of metal?
(a) Malleable
(b) Electro-positive nature
(c) Ductile
(d) None of these

Answer : D

Question. Which of the following pairs will give displacement reactions?
(a) ZnSO₄ solution and Aluminium metal
(b) MgCl₂ Solution and aluminium metal
(c) FeSO₄ solution and silver metal
(d) AgNO₃ solution and copper metal.

Answer : D

Question. A student puts one big iron nail each in four test tubes containig solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was put in the solution of
(a) zinc sulphate
(b) iron sulphate
(c) copper sulphate
(d) aluminium sulphate

Answer : C

Question. Beakers A,B and C contain zinc sulphate, silver nitrate and iron (II) sulphate solutions respectively.
Copper pieces are added to each beaker. Blue colour will appear in case of
(a) beaker A
(b) beaker B
(c) beaker C
(d) all the beakers

Answer : B

Question. Froth floatation method is used for the concentration of-
(a) oxide ores
(b) sulphide ores
(c) sulphate ors
(d) halide ores

Answer : B

Question. Pure gold is-
(a) 24 carats
(b) 22 carats
(c) 20 carats
(d) 18 carats

Answer : A

Question. Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
1. Au
2. Cu
3. Na
4. K
(a) 1 and 2
(b) 1 and 3
(c) 2 and 3
(d) 2 and 4

Answer : A

Question. Hydrogen gas is not widely used as a reducing agent because
(a) hydrogen decomposes to atomic hydrogen at higher temperature
(b) risk of explosion with water
(c) hydrogen isomerises to ortho hydrogen at higher temperature.
(d) many metals form hydrides at lower temperatures.

Answer : B

FILL IN THE BLANKS :

Question. Metals above hydrogen in the Activity series can displace .......... from dilute acids.

Answer : Hydrogen

Question. Formula of rust is ..........

Answer : Fe₂O₃ • xH₂O 

Question. Stainless steel contains ........., .......... and .........

Answer : Iron, chromium, carbon

Question. The method of removing volatile matter from carbonate ores is known as ..........

Answer : Calcination

Question. ₁₇³⁵Bis a ..........

Answer : non-metal

Question. The extraction of metals from their ores and then refining them for use is known as ........... .

Answer : Metallurgy.

Question. .......... is a metal used for galvanising.

Answer : Zinc

Question. A .......... reactive metal displaces a .......... reactive metal from its salt solution.

Answer : more, less

Question. The surface of some metals, such as iron, is corroded when they are exposed to moist air for a long period of time. This phenomenon is known as ..........

Answer : Corrosion.

Question. The main ore of copper is .........

Answer : Copper pyrites

Question. An alloy of any metal with mercury is called .......... and the electrical conductivity of an alloy is ......... than that of pure metals.

Answer : Amalgam, less

Question. An alloy is a ........... mixture of two or more metals, or a metal and a non-metal.

Answer : Homogeneous

Question. Bronze is an alloy of copper and .........

Answer : Tin

Question. An example of a metal which can be cut with a knife is ..........

Answer : Sodium

Question. Metal oxides which react with both acids as well as bases to produce salt and water are called .......... oxides.

Answer : amphoteric

Question. Most metal oxides are .......... in nature whereas nonmetal oxides are .......... or ..........

Answer : basic, acidic, neutral

Question. On hammering change of metal into thin sheets, is called ........

Answer : Melleability

Question. A non-metal, which is liquid at non temperature is ..........

Answer : Bromine

Question. Al₂O₃ and ZnO are .......... oxides.

Answer : amphoteric

Question. Froth floatation process is used for the concentration of .......... ores.

Answer : Sulphide

Question. The best conductors of electricity are copper and .........

Answer : Silver

Question. Metals are .......... conductors of heat and electricity. Non-metals are generally ..........

Answer : good, insulators

Question. Manganese and .......... react with very dilute nitric acid to evolve hydrogen gas.

Answer : Magnesium

Question. Unwanted material with ore is called as ..........

Answer : Gangue

Question. Metals combine with oxygen to form .......... oxides.

Answer : Basic

Question. Solder is an alloy of .......... and ..........

Answer : Tin, lead

Question. Most metals have .......... melting points.

Answer : High

Question. A list of common metals arranged in order of their decreasing reactivity is known as an ..........

Answer : Activity series

Question. In electrolytic refining, impure metal is used as ..........

Answer : Anode

TRUE/FALSE :

Question. The presence of carbon in pig iron makes it very soft and malleable.

Answer : False

Question. Sodium, magnesium and calcium are obtained by electrolysis of their molten chlorides.

Answer : True

Question. Non-metals are electronegative elements as they form negative ions by gaining electrons.

Answer : True

Question. Metals occur in nature only as free elements. 

Answer : False

Question. Iron does not rust in boiled distilled water.

Answer : False

Question. A more reactive metal displaces a less reactive metal from its salt solution.

Answer : True

Question. Non-metals are good conductors of heat and elecrtricity.

Answer : False

Question. Metals can form positive ions by losing electrons to non-metals.

Answer : True

Question. Gallium and Cesium metals have low melting points.

Answer : True

Question. Reaction takes place in aluminothermic process is also known as thermite reaction

Answer : True

Question. Aqua-regia can dissolve gold.

Answer : True

Question. Solder is an alloy of lead and tin.

Answer : True

Question. Reaction is done for sulphide areas

Answer : True

Question. Electrovalent compounds can conduct electricity in solid state as they have ions.

Answer : True

Question. Aluminium oxide can be reduced to aluminium, using carbon (coke) as a reducing agent.

Answer : True

Question. Lead, copper and silver cannot react with water at all.

Answer : True

Question. Hydrogen is the most abundant element in the universe.

Answer : False

Question. Mercury and zinc are purified by liquation method.

Answer : False

Question. Copper reacts with dilute sulphuric acid to form copper sulphate and hydrogen gas.

Answer : False

Question. Aluminium is the most abundant metal in the earth’s crust.

Answer : True

Question. Silver metal displaces copper from copper nitrate solution to form silver nitrate and copper metal.

Answer : True

Question. Ionic compounds are formed by transfer of electrons from a metal atom to a non-metal atom.

Answer : True

Question. Non-metals have properties similar to that of metals.

Answer : False

Question. Different metals have same reactivities with water and dilute acids.

Answer : False

Question. In electrolytic refining of copper, pure copper is taken as anode.

Answer : False

MATCHING QUESTIONS :

Question.

Answer : D

Question.

Answer : A-r, B-p, C-s, D-q

Question.

Answer : A

Question.

Answer : A-r, B-s, C-p, D-q

Question.

Answer : B

ASSERTION AND REASON :

DIRECTION : In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:
(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
(c) Assertion (A) is true but reason (R) is false.
(d) Assertion (A) is false but reason (R) is true.
(e) Both Assertion and Reason are false.

Question. Assertion : Platinum, gold and silver are used to make jewellery.
Reason : Platinum, gold and silver are least reactive metals.

Answer : A

Question. Assertion (A) : When a piece of copper metal is added to dilute sulphuric acid, the solution turns blue.
Reason (R) : Copper reacts with dilute sulphuric acid to form copper (II) sulphate solution.

Answer : A

Question. Assertion : Zinc carbonate is heated strongly in presence of air to form zinc oxide and carbon dioxide.
Reason : Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert into metal oxide.

Answer : D

Question. Assertion : Leaching is a process of reduction.
Reason : Leaching involves treatment of the ore with a suitable reagent so as to make it soluble while impurities remains insoluble.

Answer : D

Question. Assertion : Bronze is an alloy of lead and tin.
Reason : Alloys are heterogeneous mixture of metals with other metals and non-metals.

Answer : C

Question. Assertion : Iron is found in the free state n nature.
Reason : Iron a highly reactive element.

Answer : D

Question. Assertion : Leaching is a process of reduction.
Reason : Leaching involves treatment of the ore with a suitable reagent so as to make it solube while impurities remains insoluble.

Answer : D

Question. Assertion : When zinc is added to a solution of iron (II) sulphate, no change is observed.
Reason : Zinc is less reactive than iron.

Answer : D

Question. Assertion : Metals are sonorous.
Reason : They are generally brittle in the solid state; they break into pieces when hammered.

Answer : C

Question. Assertion : Magnesium chloride is an ionic compound.
Reason : Metals and non-metals react by mutual transfer of electrons.

Answer : A 

Question. Assertion : Zinc oxide amphoteric in nature.
Reason : Zinc oxide reacts with both acids and bases.

Answer : A

Question. Assertion : Lead, tin and bismuth are purified by liquation method.
Reason : Lead, tin and bismuth have low m.p. as compared to impurities.

Answer : A

Question. Assertion : While the extraction of copper, one of the steps involved is 
Cu₂S + 2Cu₂O → 6Cu + SO₂ 
Reason : In this reaction Cu₂S is the reducing agent whereas Cu₂O is the oxidising agent.

Answer : C

Question. Assertion : Froth floatation process is based on the different wetting nature of ore and gangue particles.
Reason : Mustard oil is used as frother in froth floation process.

Answer : B

Question. Assertion : Coke and flux are used in smelting.
Reason : The phenomenon in which ore is mixed with suitable flux and coke is heated to fusion is known as smelting.

Answer : B

Question. Assertion : In alumino thermite process, the metals like iron melts due to the heat evoloved in the reaction.
Reason : The reaction is 
Fe₂O₃ + 2Al → Al₂O₃ + 2Fe 

Answer : A

Question. Assertion : Levigation is used for the separation of oxide ores from impurities.
Reason : Ore particles are removed by washing in a current of water.

Answer : C

Question. Assertion : Usually the sulphide ore is converted to oxide before reduction.
Reason : Reduction of oxides occurs easier.

Answer : A

Question. Assertion : Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid
Reason : Carbon dioxide is given off in the reaction.

Answer : A

Question. Assertion : Zinc is used in the galvanisation of iron.
Reason : Its coating on iron articles increases their life by protecting them from rusting.

Answer : A

Question. Assertion : Iron pyrite is not useful in the extraction of Fe.
Reason : SO₂ polluting gas is produced during extraction.

Answer : A

Question. Assertion : Food cans are coated with tin and not with zinc.
Reason : Zinc is more reactive than tin.

Answer : A

Question. Assertion : Zinc can easily displace Copper on reacting with a solution of copper sulphate.
Reason : Copper is more reactive metal as compared to Zinc.

Answer : C

Question. Assertion : Zinc becomes dull in most air.
Reason : Zinc is coated by a thin film of its basic carbonate in moist air.

Answer : A

Question. Assertion : Different metals have different reactivities with water and dilute acids.
Reason : Reactivity of a metal depends on its position in the reactivity series.

Answer : A

Question. Assertion : Gold is isolated from other impurities by Arndt forest cyanide process.
Reason : The cyanide which is used here dissolve all possible impurities.

Answer : C

Question. Assertion : A mineral is called ore, when metal is extracted from it conveniently and economically.
Reason : All ores are minerals but all minerals are not ores.

Answer : B

Question. Assertion : Carbon reacts with oxygen to form carbon dioxide which is an acidic oxide.
Reason : Non-metals form acidic oxides.

Answer : A 

Question. Assertion : In the metallurgy of Al, purified Al₂O₃ is mixed with Na₃AlF₆ or CaF₂ .
Reason : It lowers the melting point of the mixture and brings conductivity.

Answer : A