Assertion :Contribution of ${C O}_{2}, {C H}_{4}, {C F C}_{s}$ and $N_{2} O$ toward greenhouse effect is respectively 60%, 6%, 14% and 20%. Reason: Greenhouse gases are radioactively active gases which prevent the short wavelength radiations emitted by earth to escape into space.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Greenhouse gases are necessary to keep the atmosphere on earth warm. These gases absorb the solar radiations that are transparent and thus increase the temperature of the earth. These include Carbon dioxide (60%), methane (20%) and chlorofluorocarbons (14%) and nitrous oxide (6%).
So, both the given statements are wrong and option D is the correct option.

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