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MHT CET20244 May 2024Evening ShiftChemistryChemical KineticsActual

What is the half life of a first order reaction if time required to decrease concentration of reactant from 0.8 M to 0.2 M is 12 hour?

Options

  1. A1.5 hour
  2. B3 hour
  3. C6 hour
  4. D12 hour

Correct answer

C. 6 hour

Step-by-step solution

For the first order reaction, array ll & k= 2.303 t ₁₀ [ ~A ]₀ [ ~A ]_ t = 2.303 12 hour ₁₀ [0.8] [0.2] & k =0.1919 0.6020=0.1155 hour ⁻¹ & t _ l / 2 = 0.693 0.1155 ~h ⁻¹ =6 hour array

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