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Describe the role of cryolite in the m...

Describe the role of
cryolite in the metallurgy of aluminium.
Write the chemical equations for the involved reactions.

Text Solution

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Melting point of alumina is very high and it is a bad conductor of electricity. So, cryolite is added. Role of cryolite (`Na_(3)AlF_(6)`) [or fluorspar `(CaF_(2))`] are:
(a) It lowers the melting point of the mixture
(b) It also makes a better conductor of electricity
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