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MHT CET2008ChemistryChemical Kinetics

For a first order reaction, the half-life period is

Options

  1. Adependent on the square of the initial concentration
  2. Bdependent on first power of initial concentration
  3. Cdependent on the square root of initial concentration
  4. Dindependent on initial concentration

Correct answer

D. independent on initial concentration

Step-by-step solution

t_ 1 / 2 = 1 (a)^ n-1 where, n= order of reaction a= initial concentration For first order reaction, aligned n &=1 t_ 1 / 2 &= 1 a¹-1 a &= 1 a⁰ =0 aligned Thus, for a first order reaction, t_ 1 / 2 is independent on initial concentration.

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