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  4. Metallic magnesium (Mg) is prepared by

Q. Metallic magnesium (Mg) is prepared by

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Solution:

Metallic magnesium (Mg) is prepared by electrolysis of molten . When the molten mixture of , NaCl and is electrolysed. Mg (s) is obtained at cathode and at anode.
A. Iron cannot displace Mg from solution, because Mg is more electropositive than iron.
C. In the electrolysis of (aq) solution, ions are not reduced at cathode, but is reduced in preference, because the electrode potential of is less than that of .
D. Coke cannot reduce MgO, because Mg is a stronger reducing element than carbon.

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