General Principles and Processes of Isolation of Elements Class 12 MCQ is one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Class 12 General Principles and Processes of Isolation of Elements MCQ with answers pdf which will help them all through their board test.
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.
Learn General Principles and Processes of Isolation of Elements Class 12 MCQ with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving Class 12 General Principles and Processes of Isolation of Elements MCQ with answers pdf given below.
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?
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
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?
(b) Copper pyrite
Question 6. Which one of the following is a mineral of iron?
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
Question 9. Considering Ellingham diagram, which of the following metals can be used to reduce alumina?
Question 10. Which of the following elements is present as the impurity to the maximum extent in the pig iron?
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
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
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
(b) zone refining
(c) displacement with Zn
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 :
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:
Question 26. Froth floatation is a process of:
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?
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 :
(b) C O
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?
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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Frequently Asked Question (FAQs)
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In Class 12 Chemistry Chapter 6, we have provided 34 Important MCQ Questions, But in the future, we will add more MCQs so that you can get good marks in the Class 12 exam.
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