Question
Calculate the rate constant of first order reaction A B having rate 5.4 10^ -6 \ mol dm ^ -3 s ^ -1 and [ A ] = 0.3 M.
MHT CET
Chemistry
Chemical Kinetics
2026
MHT CET 2026 (20 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 1.52 10^ -5 \ s ^ -1
- B. 1.68 10^ -5 \ s ^ -1
- C. 1.72 10^ -5 \ s ^ -1
- D. 1.80 10^ -5 \ s ^ -1
Answer
D. 1.80 10^ -5 \ s ^ -1
Step-by-step solution
For a first order reaction, the rate law is given by: Rate = k[ A ] Substituting the given values: 5.4 10^ -6 = k 0.3 k = 5.4 10^ -6 0.3 k = 18 10^ -6 \ s ^ -1 k = 1.80 10^ -5 \ s ^ -1 Answer: 1.80 10^ -5 \ s ^ -1
Related: Chemistry — Chemical Kinetics · All PYQ Banks