MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers

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

Question 1.
The salt which is least likely to be found in minerals is
(a) Chloride
(b) Sulphate
(c) Sulphide
(d) Nitrate

Answer

Answer: (d) Nitrate


Question 2.
Which of the following metals is leached by Cyanide process?
(a) Ag
(b) Na
(c) Al
(d) Cu

Answer

Answer: (a) Ag


Question 3.
In the equation 4 M + 8 CN + 2H2O + O2 → 4 [M(CN)2] + 4OH, the metal M is
(a) Copper
(b) Iron
(c) Gold
(d) Zinc

Answer

Answer: (c) Gold


Question 4.
Pyrolusite is a/an
(a) Oxide ore
(b) Sulphide ore
(c) Carbide ore
(d) not an ore.

Answer

Answer: (a) Oxide ore


Question 5.
Which of the following metals is sometimes found native in nature?
(a) Aluminium
(b) Copper
(c) Iron
(d) Magnesium

Answer

Answer: (b) Copper


Question 6.
In the process of extraction of gold.
MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers 1
Identify the complexes [X] and [Y].
(a) X = [Au (CN)2], Y = [Zn (CN)4]2-
(b) X = [ Au (CN)4]3-, Y = [Zn (CN)4]2-
(c) X = [Au (CN)2], Y = [Zn (CN)6]4-
(d) X = [Au (CN)4], Y = [Zn(CN)4]2-

Answer

Answer: (a) X = [Au (CN)2], Y = [Zn (CN)4]2-


Question 7.
The method of zone refining of metals is based on the principle of
(a) greater mobility of pure metal than that of the impurity.
(b) higher m.pt. 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.

Answer

Answer: (d) greater solubility of the impurity in the molten state than in the solid.


Question 8.
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.

Answer

Answer: (c) Cu2S


Question 9.
Heating pyrites to remove sulphur is called
(a) Smelting
(b) Calcination
(c) Liquation
(d) roasting

Answer

Answer: (d) roasting


Question 10.
In the metallurgy of which of the follo wing, cupellation process is used?
(a) Copper
(b) Silver
(c) Iron
(d) Aluminium

Answer

Answer: (b) Silver


Question 11.
Which of the following metals is most abundant in the earth’s crust?
(a) Mg
(b) Na
(c) Al
(d) Fe

Answer

Answer: (c) Al


Question 12.
Which method of purification is represented by the equations:
MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers 2
(a) Cupellation
(b) Poling
(c) van Arkel
(d) Zone-refining

Answer

Answer: (c) van Arkel


Question 13.
Which of the following benefication process is used for the mineral Al2O3.2H2O?
(a) Froth Floatation
(b) Leaching
(c) Liquation
(d) Magnetic separation

Answer

Answer: (b) Leaching


Question 14.
Which method of purification is represented by the equations
MCQ Questions for Class 12 Chemistry Chapter 6 General Principles and Processes of Isolation of Elements with Answers 3
(a) vanArkel
(b) Vapour phase refusing
(c) Liquation
(d) Poling

Answer

Answer: (b) Vapour phase refusing


Question 15.
The Mond’s process of refining is used for which of the following metals?
(a) Gold
(b) Copper
(c) Iron
(d) Nickel

Answer

Answer: (d) Nickel


Question 16.
During smelting an additional substance is added which combines with impurities to form a fusible mass. The additional substance is called
(a) Flux
(b) Slag
(c) Gangue
(d) Ore.

Answer

Answer: (a) Flux


Question 17.
Which of the following metals is obtained by leaching the ore With dilute cyanide solution?
(a) Silver
(b) Titanium
(c) Vanadium
(d) Zinc

Answer

Answer: (a) Silver


Question 18.
Zone-refining process has been employed for preparing ultra pure samples of
(a) Cu
(b) Zn
(c) Ge
(d) Ag

Answer

Answer: (c) Ge


Question 19.
The process of isolation of metals by dissolving the ore in a suitable chemical eagent following by precipitation of the metal by a more electropositive metal is called
(a) Electrometallurgy
(b) Hydrometallurgy
(c) Electro-refusing
(d) Zone-refining

Answer

Answer: (b) Hydrometallurgy


Question 20.
Smelting involves reduction of the metal oxide with
(a) Carbon
(b) CO
(c) Magnesium
(d) Aluminum

Answer

Answer: (a) Carbon


Question 21.
Which of the following is an ore of Aluminium?
(a) Na3AlF6
(b) Al2O32H2O
(c) Al2O3
(d) Al2O3 H2O

Answer

Answer: (b) Al2O32H2O


Question 22.
The process of extracting the metal from its ore is called
(a) Metallurgy
(b) Refining
(c) Concentration
(d) Leaching

Answer

Answer: (a) Metallurgy


Question 23.
In the Froth floatation process for beneficiation of the ores, the ore particles float because
(a) they are light
(b) their surface is not easily wetted by water.
(c) they bear electrostatic charge
(d) they are insoluble.

Answer

Answer: (b) their surface is not easily wetted by water.


Question 24.
The process of concentrating Au and Ag ores is based upon their solubility in
(a) NH3
(b) HNO3
(c) HCl
(d) KCN

Answer

Answer: (d) KCN


Question 25.
In the Aluminothermite process, aluminium acts as
(a) an oxidising agent
(b) a flux
(c) a reducing agent
(d) a solder

Answer

Answer: (c) a reducing agent


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