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NEET2017ChemistryChemical KineticsActual

A first-order reaction has a specific reaction rate 10 - 2 sec - 1 ⁡ . How much time will it take for 20   g the reactant to reduce to 5   g ?

Options

  1. A238 . 6   second
  2. B138 . 6   second
  3. C346 . 5   second
  4. D693 . 0   second

Correct answer

B. 138 . 6   second

Step-by-step solution

t 1 2 = 0 .693 10 - 2   second For the reduction of 20   g   of reactant to 5   g , two t 1 2 is required. ∴       t = 2 × 0 .693 10 - 2   second = 138.6   s e c o n d

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