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Question: Answered & Verified by Expert
If $t_{1 / 2} v \frac{1}{a^2}$ is a straight line graph then determine the order of reaction.
ChemistryChemical KineticsAIIMSAIIMS 2012
Options:
  • A Zero order
  • B First order
  • C Second order
  • D Third order
Solution:
2277 Upvotes Verified Answer
The correct answer is: Third order
For a $n^{\text {th }}$ order reaction,
$t_{1 / 2} \propto \frac{1}{[a]^{n-1}}$
$t_{1 / 2} \propto \frac{1}{[a]^{3-1}} \quad[\therefore n=3]$
$t_{1 / 2} \propto \frac{1}{[a]^2}$

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