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NEET2018ChemistryChemical KineticsActual

What is the correct difference between first and second order reactions?

Options

  1. AA first-order reaction can be catalyzed; 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 does
  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 does

Step-by-step solution

⇒ ( t 1 2 ) ∝ ( Initial concentration ) 1 − order of Reaction t 1 2    for   1 st order = Independent of Concentration t 1 2 for   2 nd order ∝ 1 A 0 ⇒ Rate of first order reaction ∝ ( A 0 ) 1 Rate of second order reaction ∝ ( A 0 ) 2 rate of first order reaction and second order reaction depends on initial concentration.

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