alleryWhat are the SI units of the rate constant for a first order reaction?
As^-1
Bmol L^-1 s^-1
CL mol^-1 s^-1
Dmol^2 L^-2 s^-1
Answer & Solution
Correct answer: A. s^-1
1. For first order, $k = \dfrac{\text{Rate}}{[A]^1}$.
2. $= \dfrac{\text{mol L}^{-1}\text{s}^{-1}}{\text{mol L}^{-1}}$.
3. The concentration units cancel, leaving $\text{s}^{-1}$.
_Source: syllabus Chemistry Ch 3 "Chemical Kinetics", p.8_
Keep practising Chemical Kinetics
Browse all Chemical Kinetics questions for ISC Class 12, or explore more Chemistry topics.
Related questions
Order or molecularity?Complete the definition of orderFor a first-order reaction, the half-life period $t_{1/2}$ is related to the rate constantNEET · Chemistry · Rate Law — Gap FillThree of these are wrong. Find the one that holds.Order the steps: find the order of a reactionFor rate = k[A][B]², the overall order is:The Arrhenius equation