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Question

Assertion :For A + 2B C (rate = K[A]1 [B]0), the half life time of reaction is only defined when concentration of A and B are in stoichometric ratio. Reason: For above reaction, half life of reaction is directly proportional to concentration of A and not to concentration of B due to its zero order.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution

The correct option is C Assertion is correct but Reason is incorrect
If the concentration of B is much lower than the stoichiometric concentration, then there will not be sufficient quantity of B to react with A and the half life period cannot be defined. Hence, the assertion is correct.
Since the reaction is first order with respect to A, the half life is independent of the concentration of A. Hence, the reason is not correct.

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