A) Reduction of CaO with carbon
B) Reduction of CaO with hydrogen
C) Electrolysis of a mixture of anhydrous \[\text{CaC}{{\text{l}}_{\text{2}}}\] and \[\text{KCl}\]
D) Electrolysis of molten \[\text{Ca(OH}{{\text{)}}_{2}}\]
Correct Answer: C
Solution :
Calcium is obtained by electrolysis of a fused mass of \[\text{CaC}{{\text{l}}_{\text{2}}}\]and \[\text{KCl}\]at about \[\text{700}{{\,}^{\text{o}}}\text{C}\] in an electrolytic cell made of graphite anode and iron cathode. \[CaC{{l}_{2}}\rightleftharpoons C{{a}^{2+}}+2C{{l}^{-}}\] At anode \[2C{{l}^{-}}\xrightarrow{{}}C{{l}_{2}}+2{{e}^{-}}\] At cathode \[C{{a}^{2+}}+2{{e}^{-}}\xrightarrow{{}}Ca\]
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