CBSE Class 12 Chemistry General principles and Processes of isolation of elements Question Bank

Official Class 12 Chemistry Worksheets: Unit 6 General Principles and Processes of Isolation of Elements

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Chapter-wise Practice Material: Unit 6 General Principles and Processes of Isolation of Elements

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General principles and Processes of isolation of elements
 
VSA QUESTIONS (1 - MARK QUESTIONS)
 
1. Sulphide ores are subjected to roasting, while carbonate ores are subjected to calcination. Comment on the statement
 
2. The reduction of the metal oxide is easier if the metal formed is in liquid state, at the temperature of reduction. Give reason
 
3. How is copper extracted with a low grade ore of it?
 
4. What are collectors in froth flotation process? Give one example
 
5. Name the most important form of iron. Mention its one use.
 
6. What are froth stabilizers? Give two examples
 
7. What are the constituents of German silver?
 
8. Write the reaction involved in the extraction of copper from low grade ores
 
9. The graphite electrodes in the extraction of ‘alluminium’ by Hall-Heroult process need to be changed frequently. Why?
 
10. Mention the role of following : (Each question carries one mark)
i. SiO2 in the extraction of Cu from copper matte.
ii. CaCO3 in the metallurgy of Fe.
iii. CO in the metallurgy of iron .
iv. I2 in the purification of zirconium.
v. NaCN in the extraction of gold from gold ore.
vi. Cryolite in the metallurgy of Al.
 
SA (I) QUESTIONS (2 - MARK QUESTIONS)
 
11. i. How is chemical reduction different from electrolytic reduction?
ii. Name a metal each is obtained by
(a) electrolytic reduction
(b) chemical reduction.
 
12. Write the Chemical reactions taking place in different zones in the blast furnace for the extraction of iron from its ore.
 
13. Give equations for the industrial extraction of zinc from calamine.
 
14. Gibbs energies of formation ΔfG of MgO(s) and CO(g) at 1273K and 2273 K are given below:
ΔfG [MgO(s)] = –941 kJ mol–1 at 1273 K.
ΔfG [CO(g)] = –439 kJ mol–1 at 1273 K.
ΔfG [MgO(s)] = –314 kJ mol–1 at 2273 K. ΔfG [CO(g)] = –628 kJ mol–1 at 2273 K.
 
On the basis of above data, predict the temperature at which carbon can be used as a reducing agent for MgO(s).
 
15. The choice of a reducing agent in a particular case depends on thermodynamic factor. How far do you agree with this statement? Support your opinion with two examples.
 
SA (II) TYPE QUESTIONS (3 - MARK QUESTIONS)
 
16. i. Name the principal ore of Aluminium.
ii. Write the equation for the reactions taking place at the anode and the cathode during the extraction of aluminium by the electrolytic process
 
17. i. Write the name or formula of any two sulphide ores of copper.
ii. Explain the froth floatation process
 
18. Describe how the following changesare brought about
i. Pig iron into steel
ii. Zinc Oxide into metallic zinc
iii. Impure titanium into pure titanium
 
19. Describe the principle behind each of the following processes
i. Vapour phase refining of a metal
ii. Electrolytic refining of a metal
iii. Recovery of silver after silver ore was leached with NaCN.
 
20. State the principles of the following methods of refining crude metals
i. Zone refining
ii. Liquation method
iii. Chromatographic method.

 

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Unit 6 General Principles and Processes of Isolation of Elements Practice Sheet and Solutions for Class 12 Chemistry

Unit 6 General Principles and Processes of Isolation of Elements Printable Worksheet for Class 12 Chemistry

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