Question

For extraction of sodium from $NaCl$, the electrolytic mixture $NaCl + Na_{3}AlF_{6} + CaCl_{2}$ 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 reactive than $K$ and $Ca$
• C. $NaCl$ is less stable than $Na_{3}AlF_{6}$ and $CaCl_{2}$
• D. the discharge potential of $Na^{+}$ is less than that of $K^{+}$ and $Ca^{2+}$ ions.

Answer 1

Answer: (D)

As $K$ and $Ca$ are more reactive than $Na$ & they have less discharge potential than Na so they will not discharge