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Q.

Assertion: Earth has an atmosphere but the moon does not.
Reason: Moon is small in comparison to earth
 

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a

Assertion and reason are true but Reason is correct explanation for Assertion

b

Assertion is true and Reason is false

c

Assertion and Reason are true but Reason is not correct explanation for Assertion 

d

Assertion and Reason are false

answer is A.

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Detailed Solution

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Earth has an atmosphere but the moon doesn't. Thus the assertion is correct. Also the moon is very small in comparision to earth. So the statement under reason is also correct, but, the reason is not the correct explaination to the assertion. Infact the correct explaination is that due to smaller size, the moon has less gravity than earth and so it can not hold the gases like earth and thus no atmosphere in it unlike earth.

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