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(A) In the Down's process,sodium is obtained by the electrolysis of a fused mixture of sodium chloride $(NaCl)$ and calcium chloride $(CaCl_2)$.The mi

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$NaCl + CaCl_2$

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(A) In the Down's process,sodium is obtained by the electrolysis of a fused mixture of sodium chloride $(NaCl)$ and calcium chloride $(CaCl_2)$.The mixture typically consists of $40\, \% \ NaCl$ and $60\, \% \ CaCl_2$.The primary function of adding $CaCl_2$ is to lower the melting point of the electrolyte mixture from $801\, ^{\circ}C$ to approximately $600\, ^{\circ}C$,which reduces the operating temperature and prevents the volatilization of sodium metal.At the cathode: $Na^{+} + e^{-} \longrightarrow Na$At the anode: $2Cl^{-} \longrightarrow Cl_2 + 2e^{-}$

Which one of the following electrolytes is used in Down's process for the extraction of sodium metal?

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