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NEET2019ChemistryChemical KineticsActual

Find out the time required for 2 / 3^ rd completion of a first order reaction, if the value of rate constant is 4.3 10⁻⁴ ~s ⁻¹ .

Options

  1. A0.0025 10^3 ~s
  2. B0.25 10^3 ~s
  3. C0.025 10^3 ~s
  4. D2.5 10^3 ~s

Correct answer

D. 2.5 10^3 ~s

Step-by-step solution

For a first order reaction, aligned & k= 2.303 t a a-x & t= 2.303 4.3 10⁻⁴ a a / 3 =2.55 10^3 ~s aligned

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