A) potassium chloride
B) calcium chlpnde
C) both calcium chloride and potassium fluoride
D) potassium fluoride only
Correct Answer: C
Solution :
In Down process, sodium is manufactured by the electrolysis of fused sodium chloride in the presence of \[CaC{{l}_{2}}\] and KF using graphite anode and iron cathode \[NaClN{{a}^{+}}+C{{l}^{-}}\] \[N{{a}^{+}}{{e}^{-}}\to Na\](at cathode) \[2C{{l}^{-}}\to C{{l}_{2}}+2{{e}^{-}}\](at anode) \[CaC{{l}_{2}}+KF\] lower the melting point from the 1085 K to 850 K.
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