If the concentration is expressed in moles per litre,the unit of the rate constant for a first order reaction is

  • A
    $mole \ litre^{-1} \ sec^{-1}$
  • B
    $mole \ litre^{-1}$
  • C
    $sec^{-1}$
  • D
    $mole^{-1} \ litre \ sec^{-1}$

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