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

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By Expert Faculty of Sri Chaitanya
a
CaCl2 helps in the conduction of electricity
b
Ca2+ can reduce NaCl to Na
c
Ca2+ can displace Na from NaCl
d
this mixture has a lower melting point than NaCl
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detailed solution

Correct option is D

Decrease in melting point and more conductivity.

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