Carnallite on electrolysis gives

Options

A. Ca and `Cl_(2)`
B. Na and `CO_(2)`
C. Al and `Cl_(2)`
D. Mg and `Cl_(2)`

Answer

D

Explanation

Carnallite is `(KCl. MgCl_(2).6H_(2)O`. Since the reduction potential of `Mg^(2+)` is higher than that of `K^(+)`, the following reactions take place during electrolysis.
At anode
`2Cl^(-)-2e^(-)rarrCl_(2)`
At cathode
`(Mg^(2+)2e^(-)rarrMg)`