JEE Main 20202 SeptemberMorning Shift

Exam: JEE Main
Year: 2020
Date: 2 September
Shift: Morning Shift
Subject: Chemistry
Chapter: Environmental Chemistry

JEE Main 2020 · 2 September · Morning Shift · Chemistry · Environmental Chemistry

The statement that is not true about ozone is :

Options

Ain the stratosphere, $CFC$ s release chlorine free radicals $\left(CI\right)$ which reacts with ${O}_{3}$ to give chlorine
Bin the atmosphere, it is depleted by $CFC$ s.
Cin the stratosphere, it forms a protective shield against UV radiation.
DIt is a toxic gas and its reaction with $NO$ gives ${NO}_{2}$

Correct answer

A. in the stratosphere, $CFC$ s release chlorine free radicals $\left(CI\right)$ which reacts with ${O}_{3}$ to give chlorine

Step-by-step solution

In presence of sunlight CFC’s molecule divides & release chlorine free radical, which react with ozone give chlorine monoxide radical (ClO) and oxygen

${CF}_{2}{Cl}_{2}\left(g\right)\overset{UV}{⟶}\overset{˙}{C}l\left(g\right) + \overset{˙}{C}{F}_{2}Cl\left(g\right)$

${Cl}^{*} ( g ) + {O}_{3} ( g ) ⟶ {ClO}^{*} ( g ) + {O}_{2} ( g )$

${ClO}^{∙} ( g ) + O ( g ) ⟶ {Cl}^{'} ( g ) + {O}_{2} ( g )$

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