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NTA Abhyas NEET2020ChemistryChemical KineticsPractice

The correct difference between first and second order reactions is that

Options

  1. AA first-order reaction can catalyze; a second-order reaction cannot be catalyzed
  2. BThe half-life of a first-order reaction does not depend on [ A ] 0 ; the half-life of a second-order reaction
  3. CThe rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reac
  4. DThe rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction

Correct answer

B. The half-life of a first-order reaction does not depend on [ A ] 0 ; the half-life of a second-order reaction

Step-by-step solution

For first order reaction, t 1 / 2 = 0.693 k , which is independent of initial concentration of reactant. ( t 1 / 2 ∝ a ) For second order reaction, t 1 / 2 = 1 k [ A 0 ] , which depends on initial concentration of reactant t 1 / 2 ∝ 1 a

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