CBSE Class 10 Chemistry Metals and Non-metals MCQs Set 27

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Multiple Choice Questions

Question 1: The formula of pyrolusite ore is
(a) Mn3O4
(b) MnO2
(c) Mn2O3.H2O
(d) MnO
Show Answer & Explanation

Answer: (b) MnO2

Explanation:
1. Pyrolusite is manganese dioxide, MnO2, the chief ore of manganese.

Teacher's Note:
1. Mn3O4 is hausmannite and Mn2O3.H2O is manganite.
2. Learn the ore formulas of manganese, iron and copper.

Question 2: Tin stone (cassiterite) is heavy compared with the rocky impurities. It is mainly concentrated by
(a) froth flotation
(b) magnetic separation
(c) gravity separation
(d) hand picking
Show Answer & Explanation

Answer: (c) gravity separation

Explanation:
1. Cassiterite is much denser than the gangue, so it is concentrated by washing in a stream of water (gravity separation).

Teacher's Note:
1. Froth flotation is used for sulphide ores.
2. Choose the method according to the property that differs: density, magnetism or wetting.

Question 3: In Down's process for the extraction of sodium, calcium chloride is mixed with sodium chloride
(a) because it acts as a solvent
(b) to lower the melting point
(c) to make the reduction go to completion
(d) to remove the impurities
Show Answer & Explanation

Answer: (b) to lower the melting point

Explanation:
1. Pure sodium chloride melts at 800 °C. Adding calcium chloride lowers the melting point to about 600 °C, which saves energy and reduces loss of sodium vapour.

Teacher's Note:
1. The added substance is called a flux or an additive.
2. Down's cell uses electrolysis of fused salt.

Question 4: Silver paint is a paint containing
(a) chromium powder
(b) silver powder
(c) aluminium powder
(d) nickel powder
Show Answer & Explanation

Answer: (c) aluminium powder

Explanation:
1. Silvery aluminium paint is made of fine aluminium powder in oil or varnish; it protects iron from rusting.

Teacher's Note:
1. It contains no silver in spite of its name.
2. Aluminium resists corrosion by forming an oxide layer.

Question 5: When mercury is heated with alkalies, the result is that
(a) mercuric oxide is formed
(b) mercuric hydroxide is formed
(c) mercuric chloride is formed
(d) mercury is not affected by alkalies
Show Answer & Explanation

Answer: (d) mercury is not affected by alkalies

Explanation:
1. Mercury is a noble-type metal and does not react with alkalies, even on heating.

Teacher's Note:
1. Zinc, aluminium and lead do react with alkalies.
2. Link inertness to its low position in the activity series.

Question 6: The reaction in the Bessemer converter that finally gives metallic copper is
(a) FeS + O2 gives FeO + SO2
(b) CuFeS2 + O2 gives Cu2S + FeS + SO2
(c) Cu2S + 2Cu2O gives 6Cu + SO2
(d) FeS + Cu2O gives Cu2S + FeO
Show Answer & Explanation

Answer: (c) Cu2S + 2Cu2O gives 6Cu + SO2

Explanation:
1. In the converter some Cu2S is oxidised to Cu2O, which reacts with the remaining Cu2S (self-reduction): Cu2S + 2Cu2O gives 6Cu + SO2. The other three reactions occur earlier, in roasting and slag formation.

Teacher's Note:
1. Blister copper is the product of this step.
2. The sulphur dioxide escapes from the surface as bubbles.

Question 7: Copper is mainly extracted from
(a) malachite
(b) cuprite
(c) copper pyrites
(d) copper glance
Show Answer & Explanation

Answer: (c) copper pyrites

Explanation:
1. Copper pyrites, CuFeS2, is the chief ore of copper.

Teacher's Note:
1. Malachite is a carbonate, cuprite an oxide and copper glance is Cu2S.
2. Most copper ores are sulphides.

Question 8: The oxide which is amphoteric is
(a) CuO
(b) Na2O
(c) SO2
(d) PbO
Show Answer & Explanation

Answer: (d) PbO

Explanation:
1. PbO reacts with both acids and alkalies, so it is amphoteric. CuO and Na2O are basic and SO2 is acidic.

Teacher's Note:
1. Other amphoteric oxides are ZnO and Al2O3.
2. Test with an acid and an alkali to classify an oxide.

Question 9: PbO + 2NaOH gives ______ + H2O. The product is
(a) NaPbO2
(b) Na2PbO2
(c) PbO
(d) Na2O2
Show Answer & Explanation

Answer: (b) Na2PbO2

Explanation:
1. Lead oxide behaves as an acidic oxide with alkali and gives sodium plumbite: PbO + 2NaOH gives Na2PbO2 + H2O (atoms balance: 2 Na, 1 Pb, 3 O, 2 H).

Teacher's Note:
1. Check that sodium atoms balance.
2. Plumbite is the lead salt of the acidic form of PbO.

Question 10: The alum used for purification of water is
(a) K2SO4.Al2(SO4)3.24H2O
(b) K2SO4.Cr2(SO4)3.24H2O
(c) (NH4)2SO4.Fe2(SO4)3.24H2O
(d) FeSO4.(NH4)2SO4.6H2O
Show Answer & Explanation

Answer: (a) K2SO4.Al2(SO4)3.24H2O

Explanation:
1. Potash alum, K2SO4.Al2(SO4)3.24H2O, makes suspended particles settle by coagulation.

Teacher's Note:
1. Chrome alum is violet and is used in tanning.
2. The colourless alum is the safe one for drinking water.

Question 11: German silver is an alloy of
(a) Cu + Zn
(b) Cu + Zn + Ni
(c) Cu + Sn + Zn
(d) Cu + Sn
Show Answer & Explanation

Answer: (b) Cu + Zn + Ni

Explanation:
1. German silver contains copper, zinc and nickel and has no silver in it.

Teacher's Note:
1. Brass is Cu + Zn and bronze is Cu + Sn.
2. Do not be misled by names of alloys.

Question 12: The formula of the argentocyanide ion is
(a) [Ag(CN)]2−
(b) [Ag(CN)2]−
(c) [Ag(CN)2]2−
(d) [Ag(CN)2]3−
Show Answer & Explanation

Answer: (b) [Ag(CN)2]−

Explanation:
1. Silver is Ag+ and each cyanide is CN−, so with two cyanides the net charge is +1 − 2 = −1: [Ag(CN)2]−.

Teacher's Note:
1. Add the charges of the metal ion and the ligands.
2. This ion forms when silver ore is leached with sodium cyanide.

Question 13: The main reducing agent in the extraction of iron in the blast furnace is
(a) hydrogen
(b) coke
(c) a metal
(d) carbon monoxide
Show Answer & Explanation

Answer: (d) carbon monoxide

Explanation:
1. Coke burns to carbon dioxide, which is reduced by more coke to carbon monoxide. Carbon monoxide then reduces the iron oxide: Fe2O3 + 3CO gives 2Fe + 3CO2.

Teacher's Note:
1. CO is the main reductant in the upper part of the furnace.
2. Coke is the fuel and the source of CO.

Question 14: Sodium amalgam is used as a
(a) oxidising agent
(b) reducing agent
(c) dehydrating agent
(d) hydrogenating agent
Show Answer & Explanation

Answer: (b) reducing agent

Explanation:
1. Sodium dissolved in mercury is a milder reducing agent than sodium; it releases hydrogen from water and reduces many compounds.

Teacher's Note:
1. The amalgam is easier to handle than sodium.
2. Amalgam means an alloy of mercury.

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