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NEET Chemistry QUESTION #1094
Question 1
If half-life \(t_{1/2} = 1\ \text{min}\) for a first order reaction, time required for 99.9% completion is closest to:
  • 5 minutes
  • 10 minutes✔️
  • 2 minutes
  • 4 minutes
Correct Answer Explanation
\(t = \frac{t_{1/2}}{0.301}\log\frac{100}{0.1} = \frac{1}{0.301}\times\log 1000 = \frac{1}{0.301}\times3 = \frac{3}{0.301}\approx9.97\approx10\ \text{min}\).