For a reaction,$A \rightarrow B$,the rate equation is $r = K[A]^0$. If the initial concentration of the reactant is $a \ mol \ dm^{-3}$,find the half-life time of the reaction.

  • A
    $\frac{a}{4k}$
  • B
    $\frac{a}{k}$
  • C
    $\frac{5a}{2k}$
  • D
    $\frac{a}{2k}$

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