State as to why
(ii) Alkali metals are prepared by the electrolysis of their fused chlorides?

Explanation

Alkali metals themselves are strong reducing agents. So a reducing agent stronger than alkali metal is not available. Hence they cannot be extracted by chemical reuction method.
When aqueous solutions of alkali metal salts are electrolysed hydrogen gas will be liberated at cathode instead of alkali metal. This is because the discharge potential of `H^(+)` is less than `Na^(+)`.
Hence alkali metals are prepared by the electrolysis of fused chlorides. To decrease the melting points of the alkali metal halides they are mixed with some other compounds.