# NEET Chemistry Chemical Kinetics Questions Solved

For the pseudo first order reaction A + B $\to$ P, when studied with 0.1 M of B is given by -d[A]/dt =k[A] where K = 1.85 x 104 sec-1. Calculate the value of rate constant for 0.2 M concentration of B :

(1) 1.85 x 104

(2) 1.85 x 10-4

(3) 1.85 x 10-5

(4) 1.85 x 105

(1) A + B $\to$P

-d[A]/dt = K[A]=1.85x104x[A] ....(1)

Assuming reaction to be of second order

-d[A]/dt = k[A][B] = -d[A]/dt = k'[A][0.1]....(2)

on dividing eqn (1) by (2)

1 = 1.85x104/K'x0.1 = K' = -1.85 x 105 L/mol sec

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