Chemistry - Complete Pblock- Question with Solution | TestHub

In the summer, nitrogen dioxide and methane react with chlorine monoxide and chlorine atoms which results in a shrinkage of chlorine and hence prevents ozone layer depletion.

$\mathrm{Cl}\stackrel{\bullet }{\mathrm{O} \left(\mathrm{g}\right) }+{\mathrm{NO}}_2 \left(g\right) ⟶\mathrm{ClO}\underset{\left(\mathrm{X}\right)}{\mathrm{N}}{\mathrm{O}}_2 \left(\mathrm{g}\right)$

$\mathrm{Cl} \left(\mathrm{g}\right) + {\mathrm{CH}}_4 \left(\mathrm{g}\right) \to {\mathrm{CH}}_3 \left(\mathrm{g}\right) + \mathrm{HCl} \left(\mathrm{g}\right)$

During winter, special types of clouds are formed over the Antarctic region. These clouds provide the surface for the hydrolysis of chlorine nitrate to form hypochlorous acid. 

$$\begin{gathered} {\mathrm{ClONO}}_2 \left(\mathrm{g}\right) + {\mathrm{H}}_2\mathrm{O} \left(\mathrm{g}\right) \to \mathrm{HOCl} \left(\mathrm{g}\right) + {\mathrm{HNO}}_3 \left(\mathrm{g}\right) \\ \left(\mathrm{Y}\right) \left(\mathrm{Z}\right) \end{gathered}$$

So, $\mathrm{X}={\mathrm{ClONO}}_2, \mathrm{Y}=\mathrm{HOCl}, \mathrm{Z}={\mathrm{HNO}}_3$