In a reaction,reactant $A$ decomposes $10 \%$ in $1 \ hour$,$20 \%$ in $2 \ hours$ and $30 \%$ in $3 \ hours$. The unit of rate constant of this reaction is

  • A
    $sec^{-1}$
  • B
    $mol \ L^{-1} \ sec^{-1}$
  • C
    $L \ mol^{-1} \ sec^{-1}$
  • D
    $L^{2} \ mol^{-2} \ sec^{-1}$

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