Q14 / 100 · BITSAT 2024 (Memory Based Paper 1) · Chemistry

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

  • A
    7.5 minutes
  • B
    15 minutes
  • Correct answer
    C
    30 minutes
  • D
    60 minutes

Solution

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

Hence, the correct answer is option: 'C'.

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