Question

Which of the following is not similar between a first order and pseudo first order reaction?

(a) The molecularity is one in both the reactions

(b) Both follows first order kinetics

(c) The unit of rate constant is s^-1

(d) The rate of the reaction depends only on one reactant

The question was posed to me by my college professor while I was bunking the class.

I'd like to ask this question from Chemical Kinetics in section Chemical Kinetics of Chemistry – Class 12

Answer 1

The correct choice is (a) The molecularity is one in both the reactions

Explanation: Both first order and pseudo first order reactions follow first order kinetics as in the rate of the reaction depends only on one reactant and the unit for rate constant is s^-1 but the molecularity in first order reaction should be one where as in pseudo first order reaction the molecularity can be more than one. For example: Inversion of cane sugar.