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ChemistryNEET 2025Integrated rate equations and half-life

Chemical Kinetics

If the half-life () for a first-order reaction is 1 minute, then the time required for 99.9% completion of the reaction is closest to:

  1. A.2 minutes
  2. B.4 minutes
  3. C.5 minutes
  4. D.10 minutes

Solution

99.9% completion leaves of the reactant, i.e. about -fold reduction — ten half-lives. minutes.

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