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

  • A
    $138.6$
  • B
    $346.5$
  • C
    $693.0$
  • D
    $238.6$

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