$Mg$ is obtained by

  • A
    Electrolysis of aqueous solution of $MgCl_2$.
  • B
    Electrolysis of aqueous solution of $MgCl_2$ taking $Hg$ as cathode.
  • C
    Electrolysis of molten state of $MgCl_2$.
  • D
    Electrolysis of alcoholic solution of $MgCl_2$.

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