Question

For extraction of sodium from `NaCI`, the electrolytic mixture `NaCI + Na_(3)AIF_(6) +CaCI_(2)` is used. During extraction process, only sodium is deposited on cathode but K and Ca do not because
A. Na is more reactive than K and Ca
B. Na is less reative then K and Ca
C. NaCI is less stable than `Na_(3)AIF_(6)` and `CaCI_(2)`
D. the discharge potential of `Na^(+)` is less than that of `K^(+)` and `Ca^(2+)` ions

Answer 1

Correct Answer - D
Lower discharge potential ions deposited first at cathode.