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NEET 2025
Exam
NEET
Year
2025
Subject
Chemistry
Chapter
Chemical Kinetics

NEET 2025 · Chemistry · Chemical Kinetics

If the half-life (t_ 1/2 ) for a first order reaction is 1 minutes,...

If the half-life (t1/2)\left(\mathrm{t}_{1/2}\right) for a first order reaction is 1 minutes, then the time required for 99.9%99.9 \% completion of the reaction is closest to:

Options

  1. A22 minutes \text{ minutes }
  2. B44 minutes \text{ minutes }
  3. C55 minutes \text{ minutes }
  4. D1010 minutes \text{ minutes }

Correct answer

D. 1010 minutes \text{ minutes }

Step-by-step solution

For 1st 1^{\text{st }} order reactions : t99.90%=10×t1/2t99.9%=10×1=10 minute \begin{aligned} \mathrm{t}_{99.90 \%} & =10 \times \mathrm{t}_{1/2} \\ \mathrm{t}_{99.9 \%} & =10 \times 1 \\ & =10 \text{ minute }\end{aligned}
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