Metallic magnesium is prepared by

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(D) . Metallic magnesium is prepared by the electrolysis of molten $MgCl_2$ (Down's process or similar electrolytic methods).During electrolysis,the s

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Electrolysis of molten $MgCl_2$

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(D) . Metallic magnesium is prepared by the electrolysis of molten $MgCl_2$ (Down's process or similar electrolytic methods).During electrolysis,the salt dissociates as follows:$MgCl_2 	ext{ (molten)} 	o Mg^{2+} + 2Cl^-$At the cathode: $Mg^{2+} + 2e^- 	o Mg$ (Reduction)At the anode: $2Cl^- 	o Cl_2 + 2e^-$ (Oxidation)Electrolysis of aqueous solutions is not used because $H_2$ gas would be evolved at the cathode instead of $Mg$ due to the higher reduction potential of water.

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