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Q.
Assertion: Magnesium is extracted by the electrolysis of fused mixture of $MgCl_2$/ $NaCl$ and $CaCl_2$. Reason: Calcium chloride acts as a reducing agent.
AIIMSAIIMS 2010General Principles and Processes of Isolation of Elements
Solution:
$N a C l$ and $C a C l_{2}$ are added to provide conductivity to the electrolyte and also to lower the fusion temperature of anhydrous $MgCl _{2} .$