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21/12/2021 11:06 am
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Metallic magnesium is prepared by
(a) reduction of MgO by coke.
(b) electrolysis of aqueous solution of Mg(NO3)2.
(c) displacement of Mg by iron from MgSO4 solution.
(d) electrolysis of molten MgCl2.
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21/12/2021 11:14 am
Correct answer: (c) displacement of Mg by iron from MgSO4 solution.
Explanation:
MgCl2(Molten)\(\overset{Electrolysis}{\longrightarrow}\) Mg+2 (Cation) + 2Cl-(Anion)
Anode → 2Cl- → 2Cl + 2e-, Cl + Cl → Cl2
Cathode → Mg+2 + 2e- → Mg