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JIPMER 2004
Exam
JIPMER
Year
2004
Subject
Chemistry
Chapter
Chemical Kinetics

JIPMER 2004 · Chemistry · Chemical Kinetics

For a reaction, the half-life is independent of initial...

For a reaction, the half-life is independent of initial concentration. What is the order of that reaction?

Options

  1. AZero
  2. BOne
  3. CTwo
  4. DThree

Correct answer

B. One

Step-by-step solution

For an nth n^{\text{th }} order reaction, t1/2∝1Cn−1(C= initial conc. )t_{1/2} \propto \frac{1}{C^{n-1}} \quad(C=\text{ initial conc. }) Hence, for Ist order reaction (n=1)(n=1), we have t1/2∝1C1−1∴t1/2∝C0t_{1/2} \propto \frac{1}{C^{1-1}} \therefore \quad t_{1/2} \propto C^0 Thus half life of Ist order reaction is independent of the initial concentration of reactant.
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