1.

For extraction of sodium from NaCl, the electrolytic mixture NaCl + KCl + CaCl_2is used. During extraction process, only sodium is deposited on cathode but K and Ca do not because :

Answer»

Na is more REACTIVE than K and Ca
Na is less reactive than K and Ca
NACL is less STABLE than `Na_3AlF_6` and `CaCl_2`
the discharge potential of `Na^(+)`is more than that of `K^(+)`and `Ca^(2+)`ions.

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