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Cryolite is:...

Cryolite is:

A

`Na_(3)AlF_(6)` and is used in the electrolysis of alumina for decreasing electrical conductivity

B

`Na_(3)AlF_(6)` and is used in the electrolysis of alumina for lowering the melting point of alumina

C

`Na_(3)AlF_(6)` and is used in the electrolytic purification of alumina

D

`Na_(3)AlF_(6)` and is used in the electrolysis of alumina

Text Solution

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The correct Answer is:
B
Cryolite- `Na_(3)AlF_(6)` used to lower the m.p and to increase the conductivity
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  10. Which is the strongest reducing agent?

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  11. The process in which the ore is heated in excess of air below its metl...

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  12. Which of the following metals are extracted by electrolytic reduction?

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  13. Cryolite is:

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  14. The least stable oxide at room temperature is

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  15. The oxidation state of Fe in Fe(3)O(8) is

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  16. The iron obtained from the blast furnace is called:

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  17. Which of the following elements contitutes a major impurity in pig iro...

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  18. In the course of a chemical reaction an oxidant -

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  19. Electrolytic reduction of alumina to aluminium by Hall-Heroult process...

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