For extraction of sodium from NaCI, 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

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Na is less reactive than K and Ca

Na is more reactive than K and Ca

NaCI is less stable than ${Na}_{3} {AlF}_{6}$ and ${CaCl}_{2}$

The discharge potential of ${Na}^{+}$ is less than that of $K^{+}$ and ${Ca}^{2 +}$ ions.

answer is D.

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The discharge potential of ${Na}^{+}$ is less than that of $K^{+}$ and ${Ca}^{+ 2}$ ions

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