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Assertion :Statement I : Ozone is a tri-atomic molecule of oxygen. Reason: Statement II : Ozone is concentrated mainly in stratosphere.

A

Both the statements are individually true and Statement II is the correct explanation of Statement I

B

Both the statements are individually true but Statement II is not the correct explanation of Statement I

C

Statement I is true but Statement II is false

D

Statement I is false but Statement II is true

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Solution

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Triatomic molecules are molecules composed of three atoms, of either the same or different chemical elements. Oozne consists of three atoms of O i.e $O_{3}$
About 90% of ozone is found in the stratosphere, which begins about 10.16 kilometers above Earth's surface and extends up to about 50 kilometers altitude.

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