CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set 04

Class 12 Chemistry Practice Set: Unit 6 General Principles and Processes of Isolation of Elements

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DEPARTMENT OF CHEMISTRY
 
General Principles and Processes of Isolation of Elements
 
1. Roasting process is applied to which of the following ores?
a) Galena            b) Iron pyrites    c) Copper glance    d) All
 
2. The chemical composition of „slag‟ formed during smelting process in the extraction of copper is
a) Cu2O + FeS    b) FeSiO3              c) CuFeS2             d) Cu2S + FeO
 
3. The froth floatation process is based upon
a) magnetic properties of gangue
b) specific gravity of ore particles
c) preferential wetting of ore particles by oil
d) preferential wetting of gangue particles by oil
 
4. Zone refining is based on the principle of
a) fractional distillation
b) fractional crystallisation
c) partition coefficient
d) chromatographic separation
 
5. Assertion –Reason type questions:
 
In the following questions a statement of assertion followed by a statement of reason is given,Choose the correct answer from the following choices.
(a) Both assertion and reason are correct statements and the reason is a correct explanation for assertion.
(b) Both assertion and reason are correct but reason is not a correct explanation for assertion.
(c) Assertion is correct but reason is incorrect.
(d) Assertion is wrong but reason is correct.
 
i. Assertion : Copper obtained after bassemerization is known as blister copper.
Reason : Blisters are produced on the surface of the metal due to escaping of dissolved SO2.
 
6. Out of C and CO, which is a better reducing agent at 673 K?
 
7. How is copper extracted with a low grade ore of it?
 
8. What is the role of zinc in extraction of Silver?
 
9. Describe the role of SiO2 in extraction of copper from copper matte and write the equation involved.
 
10. What is “copper matte”?
 
11. What are froth stabilizers? Give two examples
 
12. The graphite electrodes in the extraction of „aluminium‟ by Hall-Heroult process need to be changed frequently. Why?
 
13. Describe how the following changes are brought out:
a) Pig iron into steel.
b) Zinc oxide into zinc metal.
 
14. Write the chemical reactions involved in the process of extraction of Gold..
 
15. Differentiate between
a) Calcination and roasting
b) Electrolytic reduction and electrolytic refining
c) Flux and slag
 
16. Write the chemical reactions which take place in the following operations:
a) Electrolytic reduction of Al2O3.
b) Mond‟s process for refining of Ni.
 
17. Describe the principle involved in:
a) Electrolytic refining of metals.
b) Zone refining of metals
c) Froth floatation process
d) Chromatography
e) Vapour phase refining
 
18. Give reasons:
a) Copper matte is put in silica lined convertor.
b) Cryolite is added to alumina during electrolytic reduction.
c) Pine oil is used in the froth floatation process
 
19. a) Name the method used for the refining of titanium.
b) Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?
 
20. Write down the reactions taking place in different zones of a blast furnace during extraction of iron. How is pig iron different from cast iron?
 
21. a) Name the impurities deposit as anode mud during electrolytic refining of copper.
b) What type of metal can be refined by liquation method.
c) Name the method for refining of metals which are used as semiconductors.
 
22. Copper can be extracted by hydrometallurgy but not zinc. Explain?
 
23. What is German silver? Write its use.
 
24. Explain the following:-
a) Zinc but not copper is used for recovery of Ag from the complex[Ag(CN)2]−.
b) Partial roasting of sulphide ore is done in the metallurgy of copper.
c) Extraction of Cu from pyrites is difficult than that from its oxide ore through reduction.
 
25. Describe the principles of extraction of Zinc from zinc blende.
 
 
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Exam Preparation Worksheet for Class 12 Chemistry Unit 6 General Principles and Processes of Isolation of Elements

Download Practice Sheet: Unit 6 General Principles and Processes of Isolation of Elements (Class 12 Chemistry)

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