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MHT CET20226 Aug 2022Evening ShiftChemistryChemical KineticsActual

What is half-life of a first order reaction if time required to decrease concentration of reactant from 0.8 ~mol dm ⁻³ to 0.2 ~mol dm ⁻³ is 12 hour?

Options

  1. A6 hour
  2. B3 hour
  3. C1.5 hour
  4. D12 hour

Correct answer

A. 6 hour

Step-by-step solution

If conc. decreases from 0.8 mol dm ^3 to 0.2 mol dm ^3 it means 75 % of reactant is consumed aligned & t _ 75 % =2 t _ 1 / 2 & or t _ 1 / 2 =6 hr aligned

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