A black compound ' $\mathrm{X}$ ' when treated with ${\mathrm{O}}_3$ turned white. The compound ' $\mathrm{X}$ ' is

Given data-

We are given that black compound ' $\mathrm{X}$ ' when treated with ${\mathrm{O}}_3$ turned white. We are asked what The compound ' $\mathrm{X}$ ' is

Concept used – reaction and properties of the carbon family

Detailed solution-

Among the given compounds only PbS is black in colour and it decomposes as

$\mathrm{PbS}+4{\mathrm{O}}_3\to {\mathrm{PbSO}}_4+4{\mathrm{O}}_2$

The Lead sulphate formed is white in color.

Hence option B is the correct answer.