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Cryolite is...

Cryolite is

A

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

B

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

C

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

D

`Na_3AlF_(6)` and is used in the electrolysis of alumina for lowering the melting point of alumina only

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The correct Answer is:
A
Cryolite is `Na_(3)AlF_(6)` and used in the electrolysis of alumina for lowering the fusion temperature from `2050^@ C` to `950^@C` and it increases the conductivity of alumina `Al_(2)O_(3)` in Hall Heroult process.
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ERRORLESS-GENERAL PRINCIPLES & PROCESSES OF ISOLATION OF ELEMENTS-NCERT BASED QUESTIONS (Reduction of Free Metal)
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  2. Flux is used to remove

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  3. In blast furnace, iron oxide is reduced by

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  4. In the alumino thermite process aluminium acts as

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  5. Which metal can't be obtained from electrolysis

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  6. To obtain chromium from chromic oxide (Cr(3)O(3)) the method used is

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  7. Bauxite ore is made up of Al(2)O3 + SiO2 + TiO2 + Fe(2)O3 . This ore ...

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  8. Roasted copper pyrite on smelting with sand produces

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  9. Name the metal that is purified by placing the impure metal on sloping...

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  10. Cryolite is

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  11. Mark the wrong statement

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  12. When copper ore is mixed with silica in a reverberatory furnace, coppe...

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  13. In the metallurgy of aluminium,

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  14. Copper is extracted from copper pyrites by heating in a besseme...

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  15. In aluminium extraction by Bayer process, alumina is extracted from ba...

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  16. Identify the reaction that does not take place in a blast furnace

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  17. According to Ellingham diagram the oxidation reaction of carbon and ca...

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  18. From the Ellingham graphs of cabron, which of the following staement i...

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  19. The incorrect statement among the following is

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  20. In the conversion of zinc ore to zinc metal, the process of roasting i...

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