Chemical Kinetics on Chemistry related Questions and Answers

Question :   In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is 1. 30 min 2. 15 min 3. 7.5 min 4. 60 min Answer :   1 - 30 min