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Question: Answered & Verified by Expert
The units of rate constant for first order reaction are
ChemistryChemical KineticsMHT CETMHT CET 2010
Options:
  • A $\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}$
  • B $\mathrm{s}^{-1}$
  • C $\mathrm{I} \cdot \mathrm{mol}^{-1} \mathrm{~s}^{-1}$
  • D $\mathrm{I}^{2} \mathrm{mo}^{-2} \mathrm{~s}^{-1}$
Solution:
1619 Upvotes Verified Answer
The correct answer is: $\mathrm{s}^{-1}$
For $n$ th order reaction, the units of rate constant $=\left(\mathrm{mol} \mathrm{L}^{-1}\right)^{1-n} \mathrm{~s}^{-1}$
(where, $n=$ order of reaction $)$
$\therefore$ For Ist order reaction, the units of rate constant $=\left(\mathrm{mol} \mathrm{L}^{-1}\right)^{1-1} \mathrm{~s}^{-1}$
$=\mathrm{s}^{-1}$

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