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JEE Main2004ChemistryChemical KineticsActual

In 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. A30 minutes
  2. B60 minutes
  3. C7.5 minutes
  4. D15 minutes

Correct answer

A. 30 minutes

Step-by-step solution

t _ 1 / 2 =15 minutes No. of half lives s=2 ( for change of 0.1 to 0.025 ) is 30 minutes

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