The sodium is made by electrolysis of a molten mixture of 40% NaCl and 60% CaCl2 because

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CaCl2 helps in the conduction of electricity

Ca2+ can reduce NaCl to Na

Ca2+ can displace Na from NaCl

this mixture has a lower melting point than NaCl

answer is D.

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Detailed Solution

Decrease in melting point and more conductivity.

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