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CGP EDU Academic Team
Published on: August 13, 2026
For a first order reaction, the half-life is 10 mins. How much time in minutes will it take to reduce the concentration of reactant to 25% of its original concentration?
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20
It takes two half-lives to reduce the concentration of reactant to 25% of its original concentration.

Hence, total time taken = 10 + 10
= 20 minutes.
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