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Question

In the metallurgy of sodium by electrolysis, excess of calcium chloride is mixed with sodium chloride to:

A
make the latter a good conductor
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B
make the latter soft
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C
generate more energy for the electrolytic cell
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D
assist liquefaction of the latter at a much lower temperature
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Solution

The correct option is D assist liquefaction of the latter at a much lower temperature
Calcium chloride (CaCl2), is added to lower the melting point of the cell medium from the normal melting point of NaCl, 804C, to around 600C. The Na(l) and Cl2(g) produced in the electrolysis are kept from coming in contact and reforming NaCl.

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