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(a) What role does cryolite play in Hall...

(a) What role does cryolite play in Hall Harnoult process ?
(b) How can alumina be separated from silica in bauxite ore associated with silica ? Give equation also.

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(a) Cryolite `(Na_(3)AlF_(6))` lowers the melting point of `Al_(2)O_(3)` and also makes it conducting in nature.
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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Questions From Board Examinations
  1. Describe the principle behind the recovery of silver ore leached with ...

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  2. What happens when : (i)Cu(2)O undergoes self reduction in a silica l...

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  3. (a) What role does cryolite play in Hall Harnoult process ? (b) How ...

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  4. Give one example each of (i) acidic flux (ii) basic flux.

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  5. Distinguish between the following : (a) Ores and minerals (b) Flux a...

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  6. Write about Alumino thermic process with examples.

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  7. Name two important ores or iron. Write the method of extraction of iro...

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  8. Write the important ores of aluminium and the principle of extraction ...

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  9. Name a method used for removing gangue from sulphide ore.

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  10. How is wrought iron different from steel ?

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  11. Which reducing agent is employed to get copper from the low grade copp...

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  12. Outline the principle behind the refining of metals by chromatographic...

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  13. What is the role of zinc metal in the extraction of silver ?

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  14. Write a short note on leaching with an example.

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  15. How is iron extracted from its ore ? Explain with related chemical rea...

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  16. (i) Indicate the principle behind the method for the refining of nicke...

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  17. (i) Name a method used for the refining of zirconium. (ii) What is t...

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  18. (i) Indicate the principle behind the method used for the refining of ...

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  19. Write the names of the important ores of aluminium. Discuss the princi...

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  20. Write the names of any two ores of silver and give their chemical form...

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