Assertion :Primitive atmosphere was of reducing type. Reason: First hydrogen atoms combined with all oxygen.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The interstellar dust from which earth originated was especially rich in hydrogen. It readily combined with nitrogen forming ammonia, with carbon forming methane, and with oxygen forming water leaving no free oxygen. Thus early atmosphere of primitive earth was strongly reducing, it contained hydrogen, methane, ammonia and water vapours.
So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.

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Q. Assertion
If BOD level of water in reservoir is less than 5 ppm it is not polluted.

Reason
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Assertion (A) Boiling points of alcohols and ethers are high.
Reason (R) They can form intermolecular hydrogen-bonding.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Choose the correct option.

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