Question

If the compound between $X$ (metal with a valency 2) and $Y$ (a non-metal with a valency 3) is melted and an electric current passed through the molten compound, the element $X$ will be obtained:

• A. at an anode
• B. at the cathode
• C. in solution
• D. none of the above

Answer 1

The correct option is B at the cathode

The compound formed between X with valency 2 and Y with valency 3 is $X_3{Y}_2$.

In electrolysis of molten compound,

At anode: oxidation happens
$Y^{-3}\to Y+3e^{-}$

At cathode: reduction happens
$X^{+2}+2e^{-}\to X$

The element X will be obtained at the cathode.

Hence, option $B$ is correct.