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KCET2020ChemistryChemical Kinetics

The time required for 60 % completion of a first order reaction is 50 ~min . The time required for 93.6 % completion of the same reaction will be

Options

  1. A100 ~min
  2. B83.8 ~min
  3. C50 ~min
  4. D150 ~min

Correct answer

D. 150 ~min

Step-by-step solution

Time for 60 % completion =50 ~min for first order reaction. Time required for 93.6 % completion = ? k= 2.303 50 a a-0.6 a k= 2.303 50 a 0.4 a k= 2.303 50 2.5 Also, k= 2.303 x a a-.936 a 2.303 2.5 50 = 2.303 x a 0.064 a x=50 1000 64 2.5 =50 15.625 2.5 = 1.19 50 0.398 = 59.5 0.398 =150 ~min

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