Q. The rate constant for a chemical reaction has units $L\ mol^{- 1}s^{- 1}$,order of the reaction will be
A) 0
B) 1
C) 2
D) 3
Explanation
(c)
Unit of rate constant
$= \frac{time^{- 1}}{conc^{(n - 1)}}$
Where, n=order of reaction
Given, unit of rate constant =$L\ mol^{- 1}s^{- 1}$
$\therefore\ L\ mol^{- 1}s^{- 1} = \frac{(s)^{- 1}}{\left( L\ mol^{- 1} \right)^{n - 1}}$
$= \frac{(s)^{- 1}}{\left( L\ mol^{- 1} \right)^{n - 1}}$
$= s^{- 1}\left( L\ mol^{- 1} \right)^{n - 1}$
Or 1=n-1
Or n=2
$\therefore$ order of reaction =2
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.