JEE Advanced 2014 Chemistry question

For the elementary reaction M → N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is

(A)4
(B)3Correct
(C)2
(D)1

Answer: (B)

Solution

For the reaction M → N, rate , where n is the order with respect to M. If [M] is doubled, the new rate is (old rate). Given that

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Question ID VK-026331