Metallic magnesium (Mg) is prepared by

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Metallic magnesium (Mg) is prepared by electrolysis of molten $M g C l_{2}$ . When the molten mixture of $M g C l_{2}$ , NaCl and $C a C l_{2}$ is electrolysed. Mg (s) is obtained at cathode and $C l_{2} (g)$ at anode.
A. Iron cannot displace Mg from $M g S O_{4}$ solution, because Mg is more electropositive than iron.
C. In the electrolysis of $M g C l_{2}$ (aq) solution, $M g^{2 +}$ ions are not reduced at cathode, but $H^{\oplus}$ is reduced in preference, because the electrode potential of $M g^{2 +}$ is less than that of $H^{\oplus}$ .
D. Coke cannot reduce MgO, because Mg is a stronger reducing element than carbon.

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