In the parallel reactions: A → B (K1 = ln 3 min^-1) and A → C (K2 = ln 3 min^-1), the time when the concentrations of A, B and C becomes equal is

Question

Prashant Kotian · Accepted Answer

Correct answer: B. Since K1 = K2, [B] = [C] always. When [A] = [B] = [C], [A] = A0/3. [A] = A0 e^(-(K1+K2)t) = A0 e^(-2 ln 3 * t) = A0 / 3. So e^(-ln 9 * t) = 1/3 => 9^t = 3 => t = 1/2 min = 30 s. Therefore, correct answer is B.

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