JEE Main 2019ChemistryEnvironmental ChemistryEasyMCQ

JEE Main 2019 — Environmental Chemistry Question with Solution

JEE Main 2019 (08 Apr Shift 1)

Question

Assertion: Ozone is destroyed by CFCs in the upper stratosphere.
Reason: Ozone holes increase the amount of UV radiation reaching the earth.

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Show full solutionCorrect option: A
Correct answer
AAssertion and reason are correct, but the reason is not the explanation for the assertion.

Step-by-step explanation

When CFCs react with ozone, then it breaks the molecule of ozone gas which results in ozone layer depletion. Ozone layer protect us from harmful ultraviolet (UV) radiations coming from the sun. Thus, ozone holes increase the amount of UV radiation reaching the earth.

The upper stratosphere consists of ozone O3, which protect us from harmful ultraviolet UV radiations coming from sun.

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About this question

This is a previous-year question from JEE Main 2019, 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.