Question

Which concentration plot is linear for a first order reaction? (A is one of the reactant)

(a) [A] versus time

(b) [A]^2 versus time

(c) Ln[A] versus time

(d) √[A] versus time

I have been asked this question during an online interview.

My question comes from Pseudo Order Reaction in section Reaction Dynamics of Engineering Chemistry I

Answer 1

Correct answer is (c) Ln[A] versus time

The explanation is: The ln[A] versus time plot is linear and other graphs are curved for a first order reaction. For a zero order reaction, [A] versus time concentration plot is linear. For a second order reaction, 1/[A] versus time concentration plot is linear.