Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.
Reason: Air contains much more nitrogen than oxygen.

Assertion and reason both are correct statements and reason is the correct explanation for assertion.

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Assertion and reason both are correct statements but the reason is not the correct explanation for assertion.

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Assertion is a correct statement but the reason is the wrong statement.

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Assertion is a wrong statement but the reason is a correct statement.

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Assertion and reason both are wrong statements

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Solution

The correct option is D
Assertion is a wrong statement but the reason is a correct statement.

Assertion: When a hydrocarbon is combusted in air, $C O_{2}$ is the major product whereas $C O$ is produced if there is incomplete combustion of some hydrocarbon.
Reason: Air contains much more nitrogen than air.
$N_{2} = 78$ %
$O_{2} = 21$ %
Assertion is a wrong statement and Reason is a correct statement.

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Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.Reason: Air contains much more nitrogen than oxygen.

Assertion: When a hydrocarbon is combusted in air, carbon monoxide is always the major product.
Reason: Air contains much more nitrogen than oxygen.