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MCQ (Practice) - Isolation (Level 2) - Class 12 MCQ


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25 Questions MCQ Test - MCQ (Practice) - Isolation (Level 2)

MCQ (Practice) - Isolation (Level 2) for Class 12 2024 is part of Class 12 preparation. The MCQ (Practice) - Isolation (Level 2) questions and answers have been prepared according to the Class 12 exam syllabus.The MCQ (Practice) - Isolation (Level 2) MCQs are made for Class 12 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ (Practice) - Isolation (Level 2) below.
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MCQ (Practice) - Isolation (Level 2) - Question 1

Three most occuring elements in the earth crust are :

MCQ (Practice) - Isolation (Level 2) - Question 2

An ore containing the impurity of FeCr2O4 is concentrated by :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 2

FeCr2O4 due to magnetic nature is separated by magnetic seperation

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MCQ (Practice) - Isolation (Level 2) - Question 3

A piece of steel is heated until redness and then plunged into cold water or oil. This treatment of steel makes it :

MCQ (Practice) - Isolation (Level 2) - Question 4

Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false:

(i) Cu metal is extracted from its sulphide ore by reduction of Cu2O with FeS.
(ii) An ore of Tin containing FeCrO4 is concentrated by magnetic separation method.
(iii) Auto reduction process is used in the extraction Cu & Hg.
(iv) Cassiterite and Rutile are oxide ores of the metals.

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 4

(i) Cu2O + FeS → Cu2S + FeO
(ii) AsFeCrO4 is magnetic in nature.
(iii) True

MCQ (Practice) - Isolation (Level 2) - Question 5

In the extraction of aluminium :

Process X : applied for red bauxite to remove iron oxide (chief impurity)
Process Y : (Serpeck's process) : applied for white bauxite to remove Z (chief impurity) then, process X and impurity Z are :

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 6

Hoop's process of purification of aluminium involves formation of layers during electrolysis. It involves :

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 7

Metallurgical process of zinc involves roasting of zinc sulphide followed by reduction. Metallic zinc distills over as it is volatile and impurities like Cu, Pd and Fe gets condensed. The crude metal obtained is called spelter which may be purified by :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 7

The Crude metallic Zn can be purified by elctrolysis process or by distillation.

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 8

Calcination and roasting process of reduction of ores to their oxides are beneficial :

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 9

In the extraction of copper, the reaction which takes place in Bessemer converter is :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 9

The reaction which takes place in Besseiner converter during extration of Cu

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 10

Extraction of silver from argentiferrous lead (Pb + Ag) involves :

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 11

In the manufacturing of metallic sodium by fused salt–electrolysis method (Down's process), small amount of CaCl2 that added is known as auxiliary electrolyte and in used to :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 11

CaCl2 is added to improve electrical conductivity and it also decrease the m.p. of NaCl.

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 12

Metal(s) which does/do not form amalgam is/are :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 12

Fe and Pt does not form amalgam.

*Multiple options can be correct
MCQ (Practice) - Isolation (Level 2) - Question 13

Auto reduction process is used in extraction of

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 13

Auto reduction is used
For Cu, Hg, Sn

MCQ (Practice) - Isolation (Level 2) - Question 14

Match column–I and column–II and select the correct answer using the codes given below the lists:

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 14

Cyanide process → Ag and Au
floatation process → Dressing of Hgs
Electrolytic reduction → Extraction of Al
Zone refining → Ultrapure of Ge,

MCQ (Practice) - Isolation (Level 2) - Question 15

Match column–I with column–II and select the correct answer using the codes given below :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 15

(I) Iron and Cu → Bessemerisation

MCQ (Practice) - Isolation (Level 2) - Question 16

Assertion : Sulphide ores are concentrated by froth floatation process.

Reason : Pine oil acts as a frothing agent in froth floatation process.

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 16

Sulphide are is concentrated by froth floatation process.

MCQ (Practice) - Isolation (Level 2) - Question 17

Assertion : Platinum and gold occur in native state in nature.

Reason : Platinum and gold are noble metals.

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 17

Pt and Au are Noble metals.

MCQ (Practice) - Isolation (Level 2) - Question 18

Assertion : Wolframite impurities are separated from cassiterite by electromagnetic separation.

Reason : Cassiterite being magnetic is attracted by the magnet and forms a separate heap.

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 18

Wolframite/FewO4 + MnWO4 (little) is the magnetic impurity in the stone or cassiterite (SnO2)

MCQ (Practice) - Isolation (Level 2) - Question 19

Assertion : In smelting, roasted ore is heated with powdered coke in presence of a flux.

Reason : Oxides are reduced to metals by C or CO. Impurities are removed as slag.

MCQ (Practice) - Isolation (Level 2) - Question 20

Assertion : Al is used as a reducing agent in aluminothermy.

Reason : Al has a lower melting point than Fe, Cr and Mn.

MCQ (Practice) - Isolation (Level 2) - Question 21

In the commerical electrochemical process for aluminium extraction, the electrolyte used as :

[JEE 1999]

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 21

Electrolyte is Al2O3 + Na3AlF6 (molten)

MCQ (Practice) - Isolation (Level 2) - Question 22

The chemical process in the production of steel from haematite ore involve:

[JEE 2000 Qualifying]

MCQ (Practice) - Isolation (Level 2) - Question 23

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out :

[JEE 2000 Qualifying]

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 23

Cryolite forms a Melt with Lower melting point

MCQ (Practice) - Isolation (Level 2) - Question 24

The chemical composition of "slag" formed during the smelting process in the extraction of copper is :

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 24

MCQ (Practice) - Isolation (Level 2) - Question 25

Which of the follwoing processes is used in extractive metallurgy of magnesium?

[JEE 2002 Qualifying]

Detailed Solution for MCQ (Practice) - Isolation (Level 2) - Question 25

Mg is obtained by electrolysis of its fused soet.

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