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MHT CET20227 Aug 2022Evening ShiftChemistryChemical KineticsActual

What is rate constant of a first order reaction if time required to decrease concentration of reactant from 1.6 M to 0.4 M is 12 hours?

Options

  1. A0.116 hour ⁻¹
  2. B0.167 hour ⁻¹
  3. C0.4 hour ⁻¹
  4. D0.78 hour ⁻¹

Correct answer

A. 0.116 hour ⁻¹

Step-by-step solution

We know aligned K & = 2.303 t a ₀ a _ t & = 2.303 12 1.6 0.4 & = 2.303 12 ^4 & = 2.303 12 2 ^2 & =0.115 aligned

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