Calcium is obtained by the

Options

A. Electrolysis of molten `CaCl_(2)`
B. Electrolysis of a solution of `CaCl_(2)` in water
C. Reduction of `CaCl_(2)` with carbon
D. Roasting of limestone

Answer

A

Explanation

Calcium is obtained by the electrolysis of a fused mass consisting of six parts calcium chloride and one part calcium fluoride at about `700^(@)C` in an electrolytic cell made of graphite which acts as anode and a water-cooled cathode of iron which is suspendent from the top in the fused mass. On passing current, calcium is discharged at the cathode.

At cathode: `Ca^(2+)+2e^(-)rarrCa`
At anode: `2Cl^(Θ)rarrCl_(2)+2e^(-)`