Answer:
Anhydrous \[CaC{{l}_{2}}\] is mixed
with\[NaCl\] is order to reduce its melting point from 1074 K to nearly 873 K.
(Impurities lower the melting point of a solid). At this reduced temperature,
(a)
Sodium does not vaporise and no metallic fog is formed.
(b) Chlorine does not corrode the
material of the vessel.
(c) The electrolysis process
becomes comparatively cheap since consumption of electricity is reduced as
lower temperature is needed.
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