Question
Metallic magnesium is prepared by
A.
reduction of $$MgO$$ by coke.
B.
electrolysis of aqueous solution of $$Mg{\left( {N{O_3}} \right)_2}.$$
C.
displacement of $$Mg$$ by iron from $$MgS{O_4}$$ solution.
D.
electrolysis of molten $$MgC{l_2}.$$
Answer :
electrolysis of molten $$MgC{l_2}.$$
Solution :
\[\begin{align}
& \underset{\text{(Molten)}}{\mathop{MgC{{l}_{2}}}}\,\xrightarrow{\text{Electrolysis}}\underset{\text{Cation}}{\mathop{M{{g}^{+2}}}}\,+\underset{\text{Anion}}{\mathop{2C{{l}^{-}}}}\, \\
& \text{Anode}\to 2C{{l}^{-}}\to 2Cl+2{{e}^{-}},Cl+Cl\to C{{l}_{2}} \\
& \text{Cathode}\to M{{g}^{+2}}+2{{e}^{-}}\to Mg \\
\end{align}\]