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BITSAT 2024Paper 1
Exam
BITSAT
Year
2024
Paper
Paper 1
Subject
Chemistry
Chapter
Chemical Kinetics

BITSAT 2024 · Paper 1 · Chemistry · Chemical Kinetics

In a first order reaction, the concentration of the reactant,...

In a first order reaction, the concentration of the reactant, decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is

Options

  1. A7.5 minutes
  2. B15 minutes
  3. C30 minutes
  4. D60 minutes

Correct answer

C. 30 minutes

Step-by-step solution

As the concentration of reactant decreases from 0.8 to 0.4 in 15 minutes, hence the t1/2t_{1/2} is 15 minutes. To fall the concentration from 0.1 to 0.025 , we need two half lives, i.e., 30 minutes.
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