S Block Elements Question 177
Question: Metallic magnesium is prepared by
[BHU 1973, 77]
Options:
A) Reduction of $ MgO $ by coke
B) Electrolysis of aqueous solution of $ Mg(NO_3) $
C) Displacement of $ Mg $ by iron from $ MgSO_4 $ solution
D) Electrolysis of molten $ MgCl_2 $
Show Answer
Answer:
Correct Answer: D
Solution:
$ \underset{\text{(Molten)}}{\mathop{MgCl_2}}\xrightarrow{Electrolysis}\underset{Cation}{\mathop{M{{g}^{+2}}}}+\underset{Anion}{\mathop{2Cl}} $
Anode - $ 2C{{l}^{-}}\to 2Cl+2{{e}^{-}} $ , $ Cl+Cl\to Cl_2 $
Cathode - $ M{{g}^{+2}}+2{{e}^{-}}\to Mg $
BETA
