Question Pool General Principles and Processes of Isolation of Elements

General Principles and Processes of Isolation of Elements - SAMAGRA Question Pool & Answers | Class 12

Kerala Syllabus SAMAGRA SCERT SAMAGRA Question Pool for Class 12 Chemistry General Principles and Processes of Isolation of Elements

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Qn 1.

Elements used as semiconductors must be in highly pure form. Name the method used for purifying such metals and give the principle behind it.



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Qn 2.

Match the following:
       A                                                  B
1    Hydraulic washing              a    Tin
2    Bessemerisation                b    Aluminium
3    Hydrometallurgy                  c    Iron Pyrites
4    Hall Heroult  Process        d    Copper
5    Froth Floatation                   e    Silver
6    Liquation                               f    Magnetite



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Qn 3.

Identify the metal that can be purified by zone refining:
a) Si         b) Al         c)Ag             d)Cu 



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Qn 4.

Sulphide ores are generally concentrated by ------- process



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Qn 5.

Distinguish between calcination and roasting ?



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Qn 6.

Explain leaching.



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Qn 7.

Which of the following is the ore of zinc?

(a) Bauxite  b)Magnetite c)malachite d)calamine



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Qn 8.

a] Name the method used for removing gangue from sulphide ore?

b]Explain the above method.



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Qn 9.

Name the refining method of nickel?



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Qn 10.

Define a) Pig iron b) Cast iron c) Wrought iron



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Qn 11.

Although thermodynamically feasible in practise magnesium is not used for the reduction of alumina.why



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Qn 12.

a) What is Ellingham diagram?

b) Mention its application in metallurgy?



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Qn 13.

Match the following

a) Zone refining - Sn

b) Van Arkel Method-Hg

c) Electrolytic refining- Ni

d) Mond's process- Cu

e) Distillation- Ti

f) Liquation- Ge



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Qn 14.

Explain zone refining with an example?



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Qn 15.

What is the role of limestone in the extraction of iron in blast furnace?



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Qn 16.

Which is the  purest form of iron?Give its preparation



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Qn 17.

The chemical method for concentration of ore is..................



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Qn 18.

What is Ellingham diagram ? Give its significance.



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Qn 19.

Outline the principle of refining of metals of the following method.

 (a)  Distillation

 (b)  Liquation

 (c) Electrolytic refining

 (d) Zone refining        



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Qn 20.

Match the following

Methods of refining

Example

Distillation

Sn

Liquation

Ti

Electrolytic refining

Ni

Zone refining

Cu

Mond's process

Ge

Van – Arkel process

Zn