A) high temperature reduction with carbon
B) self-reduction
C) thermal decomposition
D) electrolysis of fused ionic salts
E) displacement method
Correct Answer: E
Solution :
The most electropositive metals like\[Na,K,Ca,\]\[Mg\] etc. are isolated from their ores by electrolysis of fused ionic salts. Example: On fusion: \[NaClN{{a}^{+}}+C{{l}^{-}}\] (ions become mobile) On electrolysis: At cathode: \[N{{a}^{+}}+{{e}^{-}}\xrightarrow{{}}Na\] At anode : \[C{{l}^{-}}\xrightarrow{{}}Cl+{{e}^{-}}\] \[Cl+Cl\xrightarrow{{}}C{{l}_{2}}\]
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