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KCET2021ChemistryChemical Kinetics

If the rate constant for a first order reaction is k , the time (t) required for the completion of 99 % of the reaction is given by

Options

  1. At= 4.606 k
  2. Bt= 2303 k
  3. Ct= 0.693 k
  4. Dt= 6.909 k

Correct answer

A. t= 4.606 k

Step-by-step solution

Given, for a first order reaction, let initial concentration = [R₀ ] After 99 % completion, concentration aligned [R] &=R₀-0.99 R₀ &=0.1 R₀ aligned Using formula, t= 2303 k [R₀ ] [R] = 2303 k 100 1 = 4.606 k

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