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Question

In Down's process, a small amount of KCl is added to NaCl:

A
to decrease the melting point of NaCl
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B
to increase the electrical conductivity
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C
to maintain electrical contact
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D
to prevent the oxidation of sodium metal formed
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Solution

The correct option is A to decrease the melting point of NaCl
Sodium chloride melts at a very high temperature of about 1085 K. So, a mixture containing sodium chloride, potassium chloride and potassium fluoride (NaCl+KCl+KF) is used. This mixture melts at about 850875 K. So, a small amount of KCl is added to NaCl to decrease the melting point of NaCl.

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