Question

The rate equation for the reaction 2A + B → C is found to be : rate = k[A] [B]. The correct statement in relation to this reaction is that the

(a) unit of k must be s^–1

(b) t_1/2 is a constant

(c) rate of formation of C is twice the rate of disappearance of A
(d) value of k is independent of the initial concentrations of A and B.

Answer 1

(d) : 2 A + B → C
rate = k [A] [B]
The value of k (velocity constant) is always independent of the concentration of reactant and it is a function of temperature only. Fora second order reaction, unit of rate constant, k is L mol^–1sec^–1 for a second order reaction,