S Block Elements Question 121
Question: Metallic magnesium is prepared by
Options:
A) reduction of $ MgO $ by coke.
B) electrolysis of aqueous solution of $ Mg{{(NO_3)}_2}. $
C) displacement of $ Mg $ by iron from $ MgSO_4 $ solution.
D) electrolysis of molten $ MgCl_2 $
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Answer:
Correct Answer: D
Solution:
[d] $ \underset{(Molten)}{\mathop{MgCl_2}}\xrightarrow{Electrolysis}\underset{Cation}{\mathop{M{{g}^{+2}}}}+\underset{Anion}{\mathop{2C{{l}^{-}}}} $
Anode $ \to 2C{{l}^{-}}\to 2Cl+2{{e}^{-}},Cl+Cl\to Cl_2 $
Cathode $ \to M{{g}^{+2}}+2{{e}^{-}}\to Mg $
BETA
