Verified Solution • 2025–26 Session moderate

QJEEM04Ch21bf: JEE Main 2004 Chemistry - Class 12 JEEM04Ch21bf Solution: 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

Multiple Choice Options

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

Step-by-Step Verified Solution

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

Related Learning Resources & Exam Preparation

JEE Main PYQ Question Bank
Browse year-wise authentic previous years' questions with solutions
Authentic CBT Mock Tests
Simulate official exam environment with live timer and percentile scoring