Multiple choice

The half life period of a first order reaction is 10 minutes. What is the rate constant?

  1. 6.93 x 102 min-1

  2. 0.693 x 10-2 min-1

  3. 6.932 x 10-2 min-1

  4. 69.3 x 10-1 min-1
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

For first-order reaction, k = 0.693/t(1/2) = 0.693/10 = 0.0693 min^(-1) = 6.93 × 10^(-2) min^(-1). Option A and D have incorrect orders of magnitude, and B has the wrong coefficient.

Keep practicing — related questions