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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.
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:
(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
(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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