(A) The melting point of pure $CaCl_{2}$ is very high $(1045 \ K)$.Adding $CaF_{2}$ to the electrolyte mixture lowers the melting point of the electro

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To keep the electrolyte in liquid state at a temperature lower than the melting point of $CaCl_{2}$

(A) The melting point of pure $CaCl_{2}$ is very high $(1045 \ K)$.Adding $CaF_{2}$ to the electrolyte mixture lowers the melting point of the electrolyte.This allows the electrolysis process to be carried out at a lower temperature, which saves energy and prevents the evaporation of the electrolyte.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

Medium

In the extraction of $Ca$ by electro-reduction of molten $CaCl_{2}$, some $CaF_{2}$ is added to the electrolyte for the following reason:

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A
To keep the electrolyte in liquid state at a temperature lower than the melting point of $CaCl_{2}$
B
To effect precipitation of $Ca$
C
To effect the electrolysis at lower voltage
D
To increase the current efficiency