Sodium is made by the electrolysis of a molten mixture of about `40%` NaCl and `60%` CaCl_(2)` because

Options

A. `CaCl_(2)` helps in conduction of electricity
B. This mixture has a lower melting point than NaCl
C. `Ca^(+ +)` can displace Na from NaCl
D. `Ca^(+ +)` can reduce NaCl to Na

Answer

B

Explanation

Mixing decreases melting point because it increases entropy. Because with the presence of calcium ions, the sodium ions are farther from each other and moving more randomly in respect to one another in the molten solution