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$^{ - 1}$ sec$^{ - 1}$

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