engineering chemistry MCQ #4937

The half-life of a first-order reaction is 10 minutes. The time required for 75% completion is

engineering chemistry MCQ #4937

  1. Question 1

    Q1. The half-life of a first-order reaction is 10 minutes. The time required for 75% completion is

    • A) 10 minutes
    • B) 20 minutes
    • C) 30 minutes
    • D) 40 minutes

    Answer: 20 minutes

    Explanation: For a first-order reaction, after one half-life (10 min), 50% is reacted. After another half-life (total 20 min), 75% is reacted.