Time required for 50% decomposition of a liquid in an isothermal batch reactor following first order kinetics is 2 minutes. The time required for 75% decomposition will be about _______________ minutes?
Correct answer: B. 4
- A. 3
- B. 4
- C. 6
- D. 10
Explanation
For first-order decay, each half-life reduces the remaining amount by half. Reaching 75% decomposition leaves 25%, which requires two half-lives, so the time is 2 × 2 = 4 minutes.
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