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Q.

Assertion (A): The most abundant noble gas in the atmosphere is Helium
Reason (R): The noble gas that is absent in the atmosphere is Radon.

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a

A & R is true, R is correct explanation of A

b

A & R is true, R is not correct explanation of A

c

A is false, R is true

d

A is true, R is false

answer is D.

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Detailed Solution

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The most abundant noble gas in the atmosphere is Argon.

Radon is produced during radio active day of  Ra226

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