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JEE Main2012ChemistryChemical KineticsActual

For a first order reaction, (A) products, the concentration of A changes from 0.1 ~M to 0.025 ~M in 40 minutes. The rate of reaction when the concentration of A is 0.01 ~M is :

Options

  1. A1.73 10⁻⁵ M / min
  2. B3.47 10⁻⁴ M / min
  3. C3.47 10⁻⁵ M / min
  4. D1.73 10⁻⁴ M / min

Correct answer

B. 3.47 10⁻⁴ M / min

Step-by-step solution

aligned & k = 2.303 40 0.1 0.025 & k = 0.693 20 aligned For a F.O.R., rate =k[ ~A ] ; rate = 0.693 20 10⁻²=3.47 10⁻⁴ ~M / min .

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