Question

$\mathrm{PbS}$ reacts with ozone$\left({\mathrm{O}}_3\right)$ to form lead sulphate$\left({\mathrm{PbSO}}_4\right)$ and oxygen$\left({\mathrm{O}}_2\right)$. As per the balanced equation, molecules of ozone required for every molecule of $\mathrm{PbS}$ are:

• A. 4
• B. 3
• C. 2
• D. 1

Answer 1

The correct option is A

4

The explanation for the correct option

(A) 4

Balanced equation

A balanced chemical equation has the same number of atoms on both sides of the equation.

Balanced equation of the reaction of $\mathrm{PbS}$ and ozone$\left({\mathrm{O}}_3\right)$

$\mathrm{PbS}\left(\mathrm{s}\right)+4{\mathrm{O}}_3\left(\mathrm{g}\right)\to {\mathrm{PbSO}}_4\left(\mathrm{s}\right)+4{\mathrm{O}}_2\left(\mathrm{g}\right)$

Therefore, every 1 molecule of $\mathrm{PbS}$ requires 4 molecules of ozone.