JEE Main 2020 — Environmental Chemistry Question with Solution
From: JEE Main 2020 (Online) 2nd September Morning Slot
Question
The statement that is not true about ozone is :
Choose an option
Show full solutionCorrect option: A
Correct answer
AIn the stratosphere, CFCs release chlorine
free radicals (Cl) which reacts with O3 to
give chlorine dioxide radicals
Step-by-step explanation
In the stratosphere, CFCs release chlorine free radical ().
CF2Cl2(g) (g) + F2Cl(g)
Which react with O3 to give chlorine oxide (Cl) radical not chlorine dioxide (Cl2) radical.
(g) + O3(g) Cl(g) + O2(g)
CF2Cl2(g) (g) + F2Cl(g)
Which react with O3 to give chlorine oxide (Cl) radical not chlorine dioxide (Cl2) radical.
(g) + O3(g) Cl(g) + O2(g)
Practice this on the real CBT interface
Solve this JEE Main question (and the rest of the Environmental Chemistry chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.
Solve interactively →About this question
This is a previous-year question from JEE Main 2020, covering the Environmental Chemistry chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.