engineering chemistry MCQ #4920

engineering chemistry MCQ #4920

1. Question 1

   Q1. The half-life of a first-order reaction is 20 min. What is the rate constant?

   • A) 0.0347 min-1
   • B) 0.05 min-1
   • C) 0.02 min-1
   • D) 0.01 min-1

   Answer: 0.0347 min-1

   Explanation: For a first-order reaction, t1/2 = 0.693 / k, so k = 0.693 / 20 = 0.0347 min-1.