MHT CET 2023 Chemistry question

The rate law for the reaction A + B product is rate = k [A] [B]. When will the rate of reaction increases by factor two?

(A)[A] and [B] both are doubled
(B)[A] is doubled and [B] is kept constantCorrect
(C)[B] is doubled and [A] is halved
(D)[A] is kept constant and [B] is halved

Answer: (B)

Solution

The rate is first order in each of A and B, so rate . Let the initial rate be . (a) Both doubled: , rate becomes four times. (b) [A] doubled, [B] constant: $k(2[A])[B]

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Question ID VK-098156