Question

The integration of the expression of Chicks law is given by ____________

(a) N1/N = e^kt

(b) N1/N = kt

(c) N1/N = k/t

(d) N1/N = e^-kt

This question was posed to me during an online interview.

Question is taken from Kinetics of Chemical Disinfection in division Properties of Disinfection of Environmental Engineering

Answer 1

The correct choice is (d) N1/N = e^-kt

For explanation I would say: According to Chicks law, Dy/Dt = k (N – y), by integration,

loge N1/N = -kt

= N1/N = e^-kt  Where, N1 = N – y.