Coordination Compounds: Free Online Mock Test 1

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Chemistry General Principles and Processes of Isolation of Elements Online Test Set 01: Attempt the Chemistry General Principles and Processes of Isolation of Elements Online Test Set 01 below. This online mock test is designed according to the latest syllabus and exam pattern. By practicing these Isolation of Metals MCQs, students can improve conceptual understanding, problem-solving speed, and exam accuracy.

Isolation of Metals Chemistry Online Mock Test

Our online practice test for Chemistry Isolation of Metals includes important multiple-choice questions based on standard chemistry guidelines. Students can attempt the test to check preparation level, improve time management skills, and strengthen metallurgy concepts for exams.

Free Chemistry Isolation of Metals Practice Set with Answers

This free Chemistry Isolation of Metals Practice Set contains MCQs with answers and explanations for better understanding. Regular practice helps students improve accuracy, revision, and confidence for school, board, and competitive examinations.

🧪Processes of Isolation – PYQs MCQ Quiz

🔢 Number of Questions: 26 MCQs
⏱️ Time Required: 20 minutes
📚 Subject: Chemistry (Processes of Isolation of Elements)
🎯 Difficulty Level: Standard PYQs (10+2 Level)

👨‍🎓 Ideal For:
CBSE Class XII aspirants
10+2 Board/NCERT/17+Age Chemistry students
Competitive exam learners

📌 Key Features:
Concept-based questions
Covers important periodic trends
Helps in quick revision
Useful for mock test practice

🚀 Outcome:
After completing this quiz, you will be able to confidently understand and apply General Principles and Processes of Isolation of Elements in exams.

1 / 26

In the extraction of chlorine by electrolysis of brine,

(a) oxidation of Cl⁻ ion to chlorine gas occurs

(b) reduction of Cl⁻ ion to chlorine gas occurs

(c) for overall reaction ΔG° has negative value

(d) a displacement reaction takes place.

Explanation: During electrolysis of brine, chloride ions lose electrons at the anode to form chlorine gas. It is an oxidation process.

2 / 26

When copper ore is mixed with silica in a reverberatory furnace, copper matte is produced. The copper matte contains
(a) sulphides of copper (II) and iron (II)
(b) sulphides of copper (II) and iron (III)
(c) sulphides of copper (I) and iron (II)
(d) sulphides of copper (I) and iron (III)

A

B

C

D

Solution: (c) When copper ore is mixed with silica, iron oxide slags off as iron silicate and copper is produced in the form of copper matte which contains Cu₂S (I) and FeS (II).

3 / 26

Which of the following reaction is an example of autoreduction?

(i) Fe₃O₄ + 4CO → 3Fe + 4CO₂
(ii) Cu₂O + C → 2Cu + CO
(iii) Cu²⁺(aq) + Fe(s) → Cu(s) + Fe²⁺(aq)
(iv) Cu₂O + 1/2Cu₂S → 3Cu + 1/2SO₂

A

B

C

D

Explanation: In autoreduction, one compound of the metal reduces another compound of the same metal. Here Cu₂S reduces Cu₂O to copper metal.

4 / 26

A number of elements are available in the earth’s crust but most abundant
elements are

(a) Al and Fe

(b) Al and Cu

(c) Fe and Cu

(d) Cu and Ag

Solution: (a) Al and Fe are most abundant elements in the earth’s crust.

5 / 26

Zone refining is based on the principle that .
(a) impurities of low boiling metals can be separated by distillation
(b) impurities are more soluble in molten metal than in solid metal
(c) different components of a mixture are differently adsorbed on an adsorbent
(d) vapour of volatile compound can be decomposed in pure metal

A

B

C

D

Solution: (b) Zone refining method is based on the principle that impurities are more soluble in molten metal than in the solid state of the metal.

6 / 26

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu₂O with
(a) FeS (b) CO (c) Cu₂S (d) SO₂

A

B

C

D

Solution: (C) In the extraction of copper from its sulphide ore, the metal is formed by the reduction of Cu₂O with Cu₂S. This reaction completes with the process of autoreduction.

Chemical reaction occurring in this reaction is as follows:

Cu₂O + 1/2Cu₂S → 3Cu + 1/2SO₂

In this process, copper appears as blister copper.

7 / 26

Brine is electrolysed by using inert electrodes. The reaction at anode is
(a) Cl⁻(aq) → 1/2Cl₂(g) + e⁻ ; E°cell = 1.36 V
(b) 2H₂O(l) → O₂(g) + 4H⁺ + 4e⁻ ; E°cell = 1.23 V
(c) Na⁺(aq) + e⁻ → Na(s) ; E°cell = −2.71 V
(d) H⁺(aq) + e⁻ → 1/2H₂(g) ; E°cell = 0.00 V

A

B

C

D

Solution: (a) For oxidation at anode, two possible reactions are oxidation of chlorine and of oxygen. Out of these two, oxidation of chlorine ion is preferred because oxidation of oxygen requires overvoltage.
Chlorine is obtained by electrolysis giving out hydrogen and aqueous NaOH as byproducts.

8 / 26

In the metallurgy of aluminium
(a) Al3+ is oxidized to Al(s)
(b) graphite anode is oxidized to carbon monoxide and carbon dioxide
(c) oxidation state of oxygen changes in the reaction at anode
(d) oxidation state of oxygen changes in the overall reaction involved in the process.

A

B

C

D

Solution: (b) In metallurgy of aluminium, graphite anode is oxidized to carbon monoxide and carbon dioxide, hence it has to be replaced after it is used up.
C(s) + O²⁻(melt) → CO(g) + 2e⁻
C(s) + 2O²⁻(melt) → CO₂(g) + 4e⁻

9 / 26

Electrolytic refining is used to purify which of the following metals?
(a) Cu and Zn (b) Ge and Si (c) Zr and Ti (d) Zn and Hg

A

B

C

D

Solution: (a) Copper and zinc are two metals which are generally purified by using electrolyte refining. In this process, impure metal is used as anode and pure metal is used as a cathode. Impurities from the blister copper or impure zinc deposit as anode mud.

10 / 26

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

(a) displacement of metal by some other metal from the complex ion

(b) roasting of metal complex

(c) calcinations followed by roasting

(d) thermal decomposition of metal complex

11 / 26

Choose the correct option of temperature at which carbon reduces FeO to iron and produces CO.
(a) Below temperature at point A
(b) Approximately at the temperature corresponding to point A
(c) Above temperature at point A but below temperature at point D
(d) Above temperature at point A

A

B

C

D

12 / 26

Below point ‘A’ FeO can
(a) be reduced by carbon monoxide only
(b) be reduced by both carbon monoxide and carbon
(c) be reduced by carbon only
(d) Cannot be reduced by both carbon and carbon monoxide

A

B

C

D

13 / 26

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

(a) ΔG° value for the overall reduction reaction with carbon monoxide is zero.

(b) ΔG° value for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive.

(c) ΔG° value for the overall reduction reaction with a mixture of 2 mol carbon and 1 mol oxygen will be positive.

(d) ΔG° value for the overall reduction reaction with carbon monoxide is negative.

Explanation: At point D in the Ellingham diagram, the oxidation curves of iron and carbon monoxide intersect. Therefore, the overall Gibbs free energy change for the reduction of FeO by CO becomes zero.

14 / 26

At the temperature corresponding to which of the points in figure of Q. 11-13, FeO will be reduced to Fe by coupling the reaction 2FeO → 2Fe + O₂ with all of the following reactions?

(i) C + O₂ → CO₂
(ii) 2C + O₂ → 2CO
(iii) 2CO + O₂ → 2CO₂

(a) Point A

(b) Point B

(c) Point D

(d) Point E

Explanation: At point A in the Ellingham diagram, the oxidation reactions of carbon and carbon monoxide lie below the FeO line. Hence all the given reactions can reduce FeO to iron because the overall ΔG° becomes negative.

15 / 26

Which of the following options are correct?
(a) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast.
(b) In extraction of silver, silver is extracted as cationic complex.
(c) Nickel is purified by zone refining.
(d) Zr and Ti are purified by van Arkel method.

A, B

A , C

C, D

D, A

Solution: (a), (d) Iron obtained from blast furnace is called pig iron. It contains about 4% carbon and many impurities such as Mn, P, Si, etc. The pig iron is remelted with scrap iron. This is known as cast iron. It has slightly less carbon content (3%) and is extremely hard and brittle.
Zr(s) + 2I₂ → ZrI₄(g) [870 K]
ZrI₄(g) → Zr(s) + 2I₂ [2075 K, tungsten filament]
Ti + 2I₂ → TiI₄ [530 K]
TiI₄ → Ti + 2I₂ [1700 K]

16 / 26

In the extraction of aluminium by Hall-Heroult process, purified A1203 is mixed with CaF2 to
(a) lower the melting point of A1203.
(b) increase the conductivity of molten mixture.
(c) reduce Al⁺³ into Al(s).
(d) acts as catalyst.

A, B

B, C

C, D

D, A

Solution: (a, b) CaF₂ mixed with purified Al₂O₃ helps in lowering the melting point of Al₂O₃ and increases the conductivity of the molten mixture.

17 / 26

Which of the following statements are correct about the role of substances added in the froth floatation process?
(a) Collectors enhance the non-wettability of the mineral particles.
(b) Collectors enhance the wettability of gangue particles.
(c) By using depressants in the process two sulphide ores can be separated.
(d) Froth stabilizers decrease wettability of gangue.

A, B

B, C

C, A

D, A

Solution: (a, c) Collectors like sodium ethyl xanthate are added to enhance the non-wettability of sulphide ore particles.
In the concentration of galena ore, sodium cyanide is used as a depressant for zinc sulphide. NaCN forms a complex with NaCN and deposits on the surface of ZnS which prevents it for the formation of Froth while PbS forms a froth.
Thus, by using depressant, two sulphides ores can be separated.

18 / 26

n the froth floatation process, zinc sulphide and lead sulphide can be separated by
(a) using collectors
(b) adjusting the proportion of oil to water
(c) using depressant
(d) using froth stabilisers

A, B

B, C

C, D

D, A

Solution: (b, c) Froth floatation method is used to extract metal from sulphide ore. ZnS and PbS can be separated by using depressant and adjusting the proportion of oil to water. Depressant used for this purposes is NaCN. It selectively prevents ZnS from coming to the froth.
Hence, (b) and (c) are correct choices.

19 / 26

Common impurities present in bauxite are .
(a) CuO (b) ZnO (c) Fe₂O₃ (d) SiO2

A, B

B, C

C, D

A, D

Solution: (c, d) Fe₂O₃ and SiO2 are the common impurities present in bauxite.

20 / 26

Which of the following ores are concentrated by froth floatation?
(a) Haematite (b) Galena
(c) Copper pyrites (d) Magnetite

A, B

B, C

C, D

A, D

Solution: (b, c) Sulphide ores like galena (PbS) and copper pyrites (CuFeS2) are concentrated by froth floatation.

21 / 26

Which of the following reactions occur during calcination?
(a) CaCO₃ → CaO + CO₂
(b) 2FeS₂ + 11/2 O₂ → Fe₂O₃ + 4SO₂
(c) Al₂O₃·xH₂O → Al₂O₃ + xH₂O
(d) ZnS + 3/2 O₂ → ZnO + SO₂

A, B

B, C

C, A

A, D

Solution: (a), (c) Calcination involves heating of the ore below its melting point in the absence of air or in limited supply of air. Oxygen containing ores like oxides, hydroxides and carbonates are calcined. Thus, the following reactions occur during calcination.
CaCO₃ → CaO + CO₂
Al₂O₃·xH₂O → Al₂O₃ + xH₂O

22 / 26

For the metallurgical process of which of the ores, calcined ore can be reduced by carbon?
(a) Haematite (b) Calamine (c) Iron pyrites (d) Sphalerite

A, B

B, C

C, D

A, D

Solution: (a, b) Oxides can be reduced by using carbon. Haematite (Fe₂O₃) and calamine (ZnCO₃ —> ZnO + CO2) can be reduced by carbon.

23 / 26

The main reactions occurring in blast furnace during extraction of iron from haematite are
(a) Fe₂O₃ + 3CO → 2Fe + 3CO₂
(b) FeO + SiO₂ → FeSiO₃
(c) Fe₂O₃ + 3C → 2Fe + 3CO
(d) CaO + SiO₂ → CaSiO₃

A, B

B, C

C, D

A, D

Explanation: In the blast furnace, iron oxide is mainly reduced by carbon monoxide to iron. Limestone forms CaO, which reacts with silica impurity to produce calcium silicate slag.

24 / 26

In which of the following method of purification, metal is converted to its volatile compound which is decomposed to give pure metal?
(a) Heating with stream of carbon monoxide
(b) Heating with iodine
(c) Liquation
(d) Distillation

A, B

B, C

C, D

A, D

Solution: (a), (b) Vapour phase refining method includes

(i) Heating of metal with stream of CO
Ni + 4CO → Ni(CO)₄
Ni(CO)₄ → Ni + 4CO [450–470 K] (Mond’s process)

(ii) Heating with iodine
Zr + 2I₂ → ZrI₄ [870 K]
ZrI₄ → Zr + 2I₂ [2075 K, Tungsten filament] (van Arkel method)

25 / 26

Which of the following statements are correct?
(a) A depressant prevents certain type of particle to come to the froth.
(b) Copper matte contains Cu₂S and ZnS.
(c) The solidified copper obtained from reverberatory furnace has blistered appearance due to evolution of SO₂ during the extraction.
(d) Zinc can be extracted by self-reduction.

A, B

B, D

A, C

A, D

Solution: (a, c) Depressants can prevent frothing of a particular sulphide. The solidified copper obtained in reverberatory furnace has blistered appearance hence it is called blister copper.

26 / 26

In the extraction of chlorine from brine.
(a) ΔG° for the overall reaction is negative
(b) ΔG° for the overall reaction is positive
(c) E° for the overall reaction has negative value
(d) E° for the overall reaction has positive value

A, B

B, C

C, D

A, D

Explanation: Electrolysis of brine is a non-spontaneous process. Therefore, ΔG° is positive and the standard cell potential E° is negative.
3Cl⁻ + 2H₂O → 2OH⁻ + H₂ + Cl₂
ΔG° = +422 kJ
Using ΔG° = −nFE°, E° = −2.2 V

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Coordination Compounds: Free Online Mock Test 1

🧪Processes of Isolation – PYQs MCQ Quiz

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