🧪 Chemistry · Chemical Kinetics · NEET & JEE

For a first-order reaction, a graph of ln[A] versus time gives a straight line. If the line has a slope of -0.0231 min<sup>-1</sup>, what is the half-life of the reaction?

Answer: 30 min.

A 60 min
B 15 min
C 30 min
D 23.1 min

Correct answer: C. 30 min

Explanation: Slope = -k, so k = 0.0231 min<sup>-1</sup>; t(1/2) = 0.693/k = 0.693/0.0231 = 30 min.

First-order decay curve: concentration halves every t½, and that half-life is constant - a defining test for first-order kinetics.

Concept context

Study the speed of reactions and what affects it: concentration, temperature, and catalysts. Covers rate law, order of reaction, the Arrhenius equation, and reaction mechanisms step by step.

Read the full Chemical Kinetics notes →

For a first-order reaction, a graph of ln[A] versus time gives a straight line. If the line has a slope of -0.0231 min<sup>-1</sup>, what is the half-life of the reaction?

Concept context

More Chemical Kinetics questions