Processes of Isolation of Elements-1
Chemistry Class 12 Science

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

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CBSE Class 12 General Principles and Processes of Isolation of Elements Multiple Choice Questions with Answers. MCQ Questions Class 12 General Principles and Processes of Isolation of Elements with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 General Principles and Processes of Isolation of Elements MCQs with Answers to know their preparation level.

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

Question 1: 

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

Correct Answer – (A)

Question 2 : 

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

Correct Answer – (C)

Question 3 : 

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

Correct Answer – (D)

Question 4 : 

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

Correct Answer – (D)

Question 5 : 

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.

Correct Answer – (D)

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

Question 6: 

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.

Correct Answer – (B)

Question 7: 

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

Correct Answer – (D)

Question 8: 

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

Correct Answer – (D)

Question 9: 

“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

Correct Answer – (A)

Question 10: 

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

Correct Answer – (A)

MCQ Questions Class 12 General Principles and Processes of Isolation of Elements with Answers
Set 1
Set 2
Set 3
Set 4
Set 5

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