$Mg$ is obtained by
- AElectrolysis of aqueous solution of $MgCl_2$.
- BElectrolysis of aqueous solution of $MgCl_2$ taking $Hg$ as cathode.
- CElectrolysis of molten state of $MgCl_2$.
- DElectrolysis of alcoholic solution of $MgCl_2$.
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