Metallic magnesium is prepared by

Reduction of MgO by coke

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Electrolysis of aqueous solution of Mg(NO₃)₂

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Displacement of Mg by iron from MgSO₄ solution

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Electrolysis of molten MgCl₂

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Solution

The correct option is D
Electrolysis of molten MgCl₂

$M g C l_{2} E l e c t r o l y s i s - ------ \to M g^{+ 2} + 2 C l (M o l t e n) C a t i o n A n i o n A n o d e - 2 C l^{-} \to 2 C l + 2 e^{-}, C l + C l \to C l_{2} C a t h o d e - M g^{+ 2} + 2 e^{-} \to M g$

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