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(a) Give an example of zone refining of ...

(a) Give an example of zone refining of metals.
(b) What is the role of cryolite in the metallurgy of aluminium?

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Cryolite (`Na_(3)AIF_(6)`) has two roles in the metallurgy of aluminium: (a) To decrease the melting point from 2323 K to 1140 K of the mixture. (b) To increase the electrical conductivity of `Al_(2)O_(3)` .
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