Home/
Competitive Exams/
JEE Main & Advanced/
Chemistry/
Chemical Kinetics/
Question 720012
JEE Chemistry · Hard

Chemical Kinetics: JEE Main MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
JEE MainHardQuestion 720012

Question

For a first-order reaction, the time for 75% completion (in terms of t½) is:
  1. A
    2t½
    Correct
  2. B
    t½
  3. C
    3t½
  4. D
    4t½

Correct answer

2t½

Explanation

After 1 half-life: 50% complete. After 2 half-lives: 75% complete (50% of remaining 50% reacts). So t = 2t½.

Review Chemical Kinetics notesStart timed chapter practice