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NTA Abhyas NEET2020ChemistryChemical KineticsPractice

A first order reaction has a specific reaction rate of 1 0 – 2 s e c - 1 . How much time will it take for 20 g of the reactant to reduce to 5 g?

Options

  1. A138.8 sec
  2. B346.5 sec
  3. C693.0 sec
  4. D238.6 sec

Correct answer

A. 138.8 sec

Step-by-step solution

It is based on first order kinetics so using the given relation K = 2.303 t l o g 10 N 0 N T t = 2.303 1 0 - 2 × l o g 10 20 5 On solving t = 138.87 sec.

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