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MHT CET20243 May 2024Evening ShiftChemistryChemical KineticsActual

What is rate constant of a first order reaction if 60 % reactant decompose in 45 minute?

Options

  1. A0.010 minute ⁻¹
  2. B0.015 minute ⁻¹
  3. C0.020 minute ⁻¹
  4. D0.025 minute ⁻¹

Correct answer

C. 0.020 minute ⁻¹

Step-by-step solution

If [ A ]₀=100 , then [A]_t=100-60=40 For a first order reaction, aligned k & = 2.303 t ₁₀ [ ~A ]₀ [ ~A ]_ t & = 2.303 45 ~min ₁₀ 100 40 & = 2.303 0.397 45 ~min & =0.020 minute ⁻¹ aligned

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