Class 12 Chemistry - Chapter 6: General Principles and Processes of Isolation of Elements MCQ Questions

26 Questions 52 Minutes

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Your Class 12 Chemistry Study Path

Question 1

In the metallurgy of iron from haematite, limestone is added to act as

A an oxidising agent

B a reducing agent

C slag

D flux

Question 2

Pyrolusite is an ore of

A Mn

B Sn

C Hg

D Ag

Question 3

Common impurities present in bauxite ore:

A None of these

B Fe₂O₃

C ZnO

D CuO

Question 4

The process employed for the concentration of sulphide ore is

A Calcination

B Electrolysis

C Roasting

D Froth floatation

Question 5

Electrolytic refining is used to purify which of the following metals?

A Zn and Hg

B Zr and Ti

C Ge and Si

D Cu and Zn

Question 6

Extraction of gold and silver involves leaching the metal with CN^– ion. The metal is recovered by

A thermal decomposition of metal complex.

B calcination followed by roasting.

C roasting of metal complex.

D displacement of metal by some other metal from the complex ion.

Question 7

Most abundant element in earthâ€™s crust is

A Fe

B Al

C Si

D O

Question 8

In the extraction of chlorine by electrolysis of brine

A a displacement reaction takes place.

B for overall reaction Î”G^Î˜ has negative value.

C reduction of Cl^– ion to chlorine gas occurs.

D oxidation of Cl^– ion to chlorine gas occurs.

Question 9

Brine is electrolysed by using inert electrodes. The reaction at anode is

A H⁺ (aq.) + e^– â†’ (frac { 1 }{2}) H₂ (g); E(_{ cell }^{Î˜}) = 0.00 V

B Na⁺ (aq.) + e^– â†’ Na(s); E(_{ cell }^{Î˜}) = 2.71 V

C 2H₂O (l) â†’ O₂ (g) + 4H⁺ + 4e^–; E(_{ cell }^{Î˜}) = 1.23 V

D Cl^– (aq.) â†’ (frac { 1 }{2}) Cl₂ (g) + e^–; E(_{ cell }^{Î˜}) = 1.36 V

Question 10

The metal always found in free state is

A Sodium

B Copper

C Silver

D Gold

Question 11

A number of elements are available in earthâ€™s crust but most abundant elements are

A Cu and Ag

B Fe and Cu

C Al and Cu

D Al and Fe

Question 12

Which of the following reactions is an example of auto reduction?

A Cu₂O + (frac { 1 }{2}) Cu₂S â†’ 3Cu + (frac { 1 }{2}) SO₂

B Cu²⁺(aq) + Fe(s) â†’ Cu(s) + Fe²⁺(aq)

C Cu₂O + C â†’ 2Cu + CO

D Fe₃O₄ + 4C0 â†’ 3Fe + 4CO₂

Question 13

Below point â€˜Aâ€™ FeO can

A not be reduced by both carbon and carbon monoxide.

B be reduced by carbon only.

C be reduced by both carbon monoxide and carbon.

D be reduced by carbon monoxide only.

Question 14

Bauxite is an ore of

A Zinc

B Copper

C Calcium

D Aluminium

Question 15

In …………… the metallurgy of aluminium

A oxidation state of oxygen changes in the overall reaction involved in the process.

B oxidation state of oxygen changes in the reaction at anode.

C graphite anode is oxidised to carbon monoxide and carbon dioxide.

D Al³⁺ is oxidised to Al (s).

Question 16

In which of the following minerals Al is not present?

A Fluorspar

B Feldspar

C Mica

D Cryolite

Question 17

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu₂O with

A SO₂

B Cu₂S

C CO

D FeS

Question 18

When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains

A sulphides of copper (I) and iron (III)

B sulphides of copper (I) and iron (II)

C sulphides of copper (II) and iron (III)

D sulphides of copper (II) and iron (II)

Question 19

Purest form of iron is

A pig iron

B steel

C wrought iron

D cast iron

Question 20

For the reduction of FeO at the temperature corresponding to point D, which of the following statements is correct?

A Î”G value for the overall reduction reaction with carbon monoxide is negative.

B Î”G value for the overall reduction reaction with a mixture of 2 mol carbon and 1 mol oxygen will be positive.

C Î”G value for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive.

D Î”G value for the overall reduction reaction with carbon monoxide is zero.

Question 21

Cinnabar is an ore of

A Al

B Sn

C Ag

D Hg

Question 22

Choose the correct option of temperature at which carbon reduces FeO to iron and produces CO.

A Above temperature at point A.

B Above temperature at point A but below temperature at point D.

C Approximately at the temperature corresponding to point A.

D Below temperature at point A.

Question 23

Zone-refining is used for the

A purification of an ore.

B purification of metal

C reduction of metal oxide

D concentration of an ore

Question 24

Malachite is an ore of

A Mn

B Sn

C Cu

D Hg

Question 25

Zone refining is based on the principle that

A vapours of volatile compound can be decomposed in pure metal.

B different components of a mixture are differently adsorbed on an adsorbent.

C impurities are more soluble in molten metal than in solid metal.

D impurities of low boiling metals can be separated by distillation.

Question 26

Which of the following ores is concentrated by the froth floatation process?

A Bauxite

B Copper pyrite

C Magnetite

D Haematite

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Class 12 Chemistry - Chapter 6: General Principles and Processes of Isolation of Elements MCQ Questions

Your Class 12 Chemistry Study Path

In the metallurgy of iron from haematite, limestone is added to act as

Pyrolusite is an ore of

Common impurities present in bauxite ore:

The process employed for the concentration of sulphide ore is

Electrolytic refining is used to purify which of the following metals?

Extraction of gold and silver involves leaching the metal with CN– ion. The metal is recovered by

Most abundant element in earthâ€™s crust is

In the extraction of chlorine by electrolysis of brine

Brine is electrolysed by using inert electrodes. The reaction at anode is

The metal always found in free state is

A number of elements are available in earthâ€™s crust but most abundant elements are

Which of the following reactions is an example of auto reduction?

Below point â€˜Aâ€™ FeO can

Bauxite is an ore of

In …………… the metallurgy of aluminium

In which of the following minerals Al is not present?

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu2O with

When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains

Purest form of iron is

For the reduction of FeO at the temperature corresponding to point D, which of the following statements is correct?

Cinnabar is an ore of

Choose the correct option of temperature at which carbon reduces FeO to iron and produces CO.

Zone-refining is used for the

Malachite is an ore of

Zone refining is based on the principle that

Which of the following ores is concentrated by the froth floatation process?

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Extraction of gold and silver involves leaching the metal with CN^– ion. The metal is recovered by

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu₂O with