Q. The half-life period of a first order reaction is 69.3 s. what is the rate constant?
A) $0.01s^{- 1}$
B) $0.1s^{- 1}$
C) $1s^{- 1}$
D) $10s^{- 1}$
Explanation
(a)
For first order reaction,
Half-life period $\left( t_{1/2} \right) = \frac{0.693}{k}$
Where, k=rate constant
$\left( t_{1/2} \right) = \frac{0.693}{69.3}s^{- 1}$
=0.01 $s^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.