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  • Calcium is obtained byOption: 1 Reduction of calcium chloride with carbonOption: 2 Electrol

Calcium is obtained by

Option: 1

Reduction of calcium chloride with carbon


Option: 2

Electrolysis of solution of calcium chloride in \mathrm{H}_{2} \mathrm{O}


Option: 3

Roasting of limestone


Option: 4

Electrolysis of molten anhydrous calcium chloride


Answers (1)

best_answer

Calcium is obtained by the electrolysis of a fused mixture of anhydrous \mathrm{CaCl}_{2}  in a graphite linked tank which serves as anode. The cathode is a hollow movable iron rod which is kept cool. During electrolysis calcium is deposited at cathode while \mathrm{Cl}_{2} is liberated at anode.

\mathrm{CaCl}_{2} \rightleftharpoons \mathrm{Ca}^{2+}+2 \mathrm{Cl}^{-}
\text {At cathode : } \mathrm{Ca}^{2+}+2 \mathrm{e}^{-} \longrightarrow \mathrm{Ca}
\text { At anode }: 2 \mathrm{Cl}^{-} \longrightarrow \mathrm{Cl}_{2}+2 \mathrm{e}^{-}.

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