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Chemical Kinetics question

2018 · Q82
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Chemical Kinetics question

2018 · Q82

NEETChemistryChemical KineticsMCQ+4 / −1
The correct difference between first and second order reactions is that
  1. A
    the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
  2. B
    the half-life of a first-order reaction does not depend on [A]0 ; the half-life of a second order reaction does depend on [A]0
  3. C
    a first-order reaction can be catalysed; a second-order reaction cannot be catalysed
  4. D
    the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
View written solutionFree

Correct answer: B

For the first order reaction, t1/2 = 0.693k{{0.693} \over k}k0.693​
which is independent of initial concentration [A]0.

For second order reaction, t1/2 = 1k[A]0{1 \over {k{{\left[ A \right]}_0}}}k[A]0​1​
which depends on initial concentration [A]0.

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