MCQ Question for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements

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General Principles and Processes of Isolation of Elements MCQ Questions for Class 12 with Answers

Class 12 Chemistry MCQ with answers are given here to chapter General Principles and Processes of Isolation of Elements. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Chemistry syllabus. By Solving these Class 12 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

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Question 1. “Metals are usually not found as nitrates in their ores.” Out of the following two (I and II) reasons which is/are true for the above observation?
I. Metal nitrates are highly unstable.
II. Metal nitrates are highly soluble in water.
(a) I is false but II is true.
(b) I is true but II is false.
(c) I and II are true.
(d) I and II are false 

Question 2. Which one is malachite from the following?
(a) CuCO₃.Cu(OH)₂
(b) CuFeS₂
(c) Cu(OH)₂
(d) Fe₃O₄ 

Question 3. Identify the incorrect statement.
(a) The scientific and technological process used for isolation of the metal from its ore is known as metallurgy.
(b) Minerals are naturally occurring chemical substances in the earth’s crust.
(c) Ores are minerals that may contain a metal.
(d) Gangue is an ore contaminated with undesired materials.

Question 4. Cassiterite is an ore of
(a) Sb
(b) Ni
(c) Mn
(d) Sn 

Question 5. Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offer an exception and is concentrated by chemical leaching?
(a) Galena
(b) Copper pyrite
(c) Sphalerite
(d) Argentite

Question 6. Which one of the following is a mineral of iron?
(a) Malachite
(b) Cassiterite
(c) Pyrolusite
(d) Magnetite 

Question 7. In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with
(a) carbon monoxide
(b) copper (I) sulphide
(c) sulphur dioxide
(d) iron (II) sulphide.

Question 8. Roasting of sulphides gives the gas X as a byproduct.
This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is
(a) CO₂
(b) SO₃
(c) H₂S
(d) SO₂

Question 9. Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
(a) Fe
(b) Zn
(c) Mg
(d) Cu 

Question 10. Which of the following elements is present as the impurity to the maximum extent in the pig iron?
(a) Manganese
(b) Carbon
(c) Silicon
(d) Phosphorus

Question 11. The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
(a) Fe₂O₃(s) + 3CO(g) → 2Fe(l) + 3CO₂(g)
(b) CaCO₃(s) → CaO(s) + CO₂(g)
(c) CaO(s) + SiO₂(s) → CaSiO₃(s)
(d) 2C(s) + O₂(g) → 2CO(g)

Question 12. The metal oxide which cannot be reduced to metal by carbon is
(a) Al2O₃
(b) PbO
(c) ZnO
(d) Fe2O₃

Question 13. Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of
(a) Al₂O₃ + HF + NaAlF₄
(b) Al₂O₃ + CaF₂ + NaAlF₄
(c) Al₂O₃ + Na₃AlF₆ + CaF₂
(d) Al₂O₃ + KF + Na₃AlF₆ 

Question 14. Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
(a) The DGf° of the sulphide is greater than those for CS2 and H2S.
(b) The DGf° is negative for roasting of sulphide ore to oxide.
(c) Roasting of the sulphide to the oxide is thermodynamically feasible.
(d) Carbon and hydrogen are suitable reducing agents for metal sulphides.

Question 15. Nitriding is the process of surface hardening of steel by treating it in an atmosphere of
(a) NH₃
(b) O₃
(c) N₂
(d) H₂S

Question 16. Calcium is obtained by
(a) reduction of calcium chloride with carbon
(b) electrolysis of molten anhydrous calcium chloride
(c) roasting of limestone
(d) electrolysis of solution of calcium chloride in H₂O.

Question 17. Purification of aluminium, by electrolytic refining, is known as
(a) Hoope’s process
(b) Baeyer’s process
(c) Hall’s process
(d) Serpeck’s process. 

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Question 18. Which of the following pairs of metals is purified by van Arkel method?
(a) Ga and In
(b) Zr and Ti
(c) Ag and Au
(d) Ni and Fe 

Question 19. Extraction of gold and silver involves leaching with
CN– ion. Silver is later recovered by
(a) distillation
(b) zone refining
(c) displacement with Zn
(d) liquation

Question 20. Identify the correct statement from the following :
(a) Wrought iron is impure iron with 4% carbon.
(b) Blister copper has blistered appearance due to evolution of CO₂.
(c) Vapour phase refining is carried out for Nickel by van Arkel method.
(d) Pig iron can be moulded into a variety of shapes.

Question 21. The process does not involve a catalyst is :
(a) Haber process
(b) Contact process
(c) Thermite process
(d) Ostwald process

Question 22. Chief ore of Al is :
(a) cryolite
(b) bauxite
(c) feldspar
(d) kaolin

Question 23. The method of zone refining of metals is based on the principle of
(a) greater mobility of the pure metal than that of the impurity
(b) higher melting point of the impurity than that of the pure metal
(c) greater noble character of the solid metal than that of the impurity
(d) greater solubility of the impurity in the molten state than in the solid.

Question 25. Mac Arthur process is used for the extraction of: 
(a) Au
(b) Pt
(c) Cu
(d) Zn

Question 26. Froth floatation is a process of: 
(a) Oxidation
(b) Reduction
(c) Refining
(d) Concentration

Question 27. Flux is used to remove : 
(a) basic impurities
(b) acidic impurities
(c) all types of impurities
(d) acidic and basic both impurities

Question 28. Which of the following is a carbonate ore?
(a) Pyrolusite
(b) Malachite 
(c) Diaspore
(d) Cassiterite

Question 29. Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of metals? 
(a) FeO, SnO
(b) SnO, ZnO
(c) BaO, Na2O₂
(d) FeO, ZnO

Question 30. In the extraction of copper from its sulphide ore, the metal is formed by reduction of Cu2O with :
(a) FeS
(b) C O
(c) Cu2S
(d) SO₂

Question 31. The main reactions occurring in blast furnace during extraction of iron from haematite are________.
(i) Fe₂O₃ + 3CO → 2Fe + 3CO₂
(ii) FeO + SiO₂ → FeSiO₃
(iii) Fe2O3 + 3C → 2Fe + 3CO
(iv) CaO + SiO₂ → CaSiO₃
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (i), (ii) and (iii)

Question 32. 2CuFeS₂ +O₂ →Cu₂S + 2FeS + SO₂ Which process of metallurgy of copper is represented by above equation? 
(a) Concentration
(b) Roasting
(c) Reduction
(d) Purification

Question 33. In metallurgical process of aluminium, cryolite is mixed with alumina in its molten state, because it 
(a) decreases the amount of alumina
(b) oxidises the alumina
(c) increases the melting point of alumina
(d) decreases the melting point of alumina

Question 34. Sulfide ores are common for the metals 
(a) Ag, Cu and Pb
(c) Ag, Cu and Sn
(b) Ag, Mg and Pb
(d) Al, Cu and Pb

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