s-Block ElementsHard

Question

Which one of the following electrolyte is used in Down′s process of extracting sodium metal ?

Options

A.NaCl + CaCl2 + KF
B.NaCl
C.NaOH + KCl + KF
D.NaCl + NaOH

Solution

Down′s process involves the electrolysis of fused sodium chloride containing CaCl2 & KF using Fe as cathode & graphite as anode at about 600oC. CaCl2 & KF are added to decrease fusion temperature (1600oC).

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