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Aluminium is extracted from alumina (Al(...

Aluminium is extracted from alumina `(Al_(2)O_(3))` by electrolysis of a molten mixture of :

A

`Al_(2)O_(3)+HF+NaAlF_(4)`

B

`Al_(2)O_(3)+CaF_(2)+NaAlF_(6)`

C

`Al_(2)O_(3)+Na_(3)AlF_(6)+CaF_(2)`

D

`Al_(2)O_(3)+KF+Na_(3)AlF_(6)`

Text Solution

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The correct Answer is:
C
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DINESH PUBLICATION-GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS -Multiple Choice
  1. Native silver metal forms a water soluble complex with a dilute soluti...

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  2. Which method of purification is represented by the following equations...

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  3. Aluminium is extracted from alumina (Al(2)O(3)) by electrolysis of a m...

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  4. Which one of the following is a mineral of iron ?

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  5. In the cyanide extraction process of silver from argentite ore, the ox...

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  6. Sulphide ores are common for the metals

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  7. The metallic lustre of metals is due to :

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  8. The process of zone refining is used in the purification of :

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  9. Which is an oxide ore ?

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  10. In the metallurgy of iron, when lime stone is added to blast furnace, ...

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  11. The statement that is NOT correct is that

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  12. Cryolite is

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  13. In the extraction of copper from its sulphide ore, the metal is finall...

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  14. Metals are usually not found as nitrates in their ores. Out of the fol...

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  15. In the context of the Hall-Heroult process for the extraction of Al, w...

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  16. Roasted gold ore +CN^(-)+H(2)O overset(O(2)) to [X]+OH^(-)

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  17. Which of the following ores is best concentrated by Froth Floatation p...

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  18. Which of the following is a carbonate ore ?

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  19. Extraction of gold and silver involves leaching the metal with CN^(-) ...

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  20. Purification of alumina by electrorefining is known as :

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