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What 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: NCERT Class 12 Chemistry Ch 3 "Chemical Kinetics", p.8_
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