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Physical Properties of Boron Family

In the extrac...

Question

In the extraction of aluminium, the function of cryolite is to:

A

Lower the melting point of alumina

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B

Increase the melting point of alumina

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C

Remove impurities from alumina

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D

Minimise the anodic effect

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Solution

The correct option is A
Lower the melting point of alumina

Melting point of $A I_{2} O_{3}$ is very high, adding impurities reduces melting point

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Q. In the extraction of aluminium, the function of cryolite is to:

Q. Function of adding cryolite in the extraction of aluminium from pure alumina is

Q. (a) Give the chemical name and formula of 'cryolite'.
(b) What is the function of cryolite in the extraction of aluminium, other than acting as a solvent for bauxite?

Q. Assertion :Cryolite is employed in the extraction of aluminium. Reason: Cryolite lowers the melting point of

A l_{2} O_{3}

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