NaCl is taken in molten state so it conducts eletricity because of the free electrons, so why are the free electrns present only in its molten state and not in its solid state and therefore resulting in soid NaCl not conducting electricity.

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Sodium is made by the electrolysis of molten mixture of about 40% NaCl and 60% CaCl2 because:

The correct option is D this mixture has a lower melting point than NaClSodium is obtained by electrolytic reduction of its chloride. Melting point of chloride of sodium is high so in order to lower its melting point, calcium chloride is added to it.

Sodium is made by the electrolysis of molten mixture of about $40 % N a C l$ and $60 %$ $C a C l_{2}$ because:

The correct option is D this mixture has a lower melting point than $N a C l$
Sodium is obtained by electrolytic reduction of its chloride. Melting point of chloride of sodium is high so in order to lower its melting point, calcium chloride is added to it.