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Explain the basic principles of the foll...

Explain the basic principles of the following metallurgical operations :
(i) Zone refining (ii) Vapour phase refining (iii) Electrolytic refining

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ICSE-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -EXERCISE (PART-II ( DESCRIPTIVE QUESTIONS )) (SHORT ANSWER QUESTIONS)
  1. Name the principal ore of aluminium.

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  2. Describe the leaching of aluminium ore.

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  3. Explain the basic principles of the following metallurgical operations...

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  4. State briefly the principles which serve as the basis for the followin...

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  5. Write the chemical reactions which take place in the following operati...

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  6. Write the chemical reactions which take place in the following operati...

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  7. Write the chemical reactions which take place in the following operati...

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  8. What chemical principle is involved in choosing a reducing agent for g...

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  9. Describe the role of the following: NaCN in the extraction of silve...

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  10. Describe the role of the following: Cryolite in the extraction of a...

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  11. Give reason : Reduction of Cr(2) O(3) with Al is thermodynamically fea...

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  12. Account for the following facts: (a) The reduction of a metal oxide ...

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  13. Account for the following facts : pine oil is used in froth floatat...

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  14. Name the method used for the refining of (i) nickel (ii) zirconium.

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  15. The extraction of Au by leaching with NaCN involves both oxidation and...

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  16. Describe how the following changes are brought about: Pig iron into...

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  17. Describe how the following changes are brought about: Zinc oxide to...

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  18. Describe how the following changes are brought about: Impure titani...

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  19. What is the utility of air blast in the extraction of iron in blast fu...

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  20. What is 'anodisation'? Give an example of the process.

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