For the parallel reactions: A --(K1)-- B and A --(K2)-- C, the initial concentration of 'A' is CA0 and initially 'B' and 'C' are absent. Concentrations of A, B and C at any time 't' is CA, CB and CC

Question

For the parallel reactions: A --(K1)--> B and A --(K2)--> C, the initial concentration of 'A' is CA0 and initially 'B' and 'C' are absent. Concentrations of A, B and C at any time 't' is CA, CB and CC, respectively. The correct relation(s) is/are

Prashant Kotian · Accepted Answer

Correct answer: A,B,C,D. By mass conservation, CA + CB + CC = CA0. Differentiating gives the zero sum of rates. For parallel first-order reactions, product ratio CB/CC always equals the ratio of their rate constants K1/K2. The fractional yield of B from reacted A is K1 / (K1 + K2). Therefore, correct answer is A,B,C,D.

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