In a pseudo first order hydrolysis of ester in water,the following results were obtained:
$t \ (s)$ $0$ $30$ $60$ $90$
$[\text{Ester}] \ (mol \ L^{-1})$ $0.55$ $0.31$ $0.17$ $0.085$

What will be the average rate of reaction between the time interval $30 \ s$ to $60 \ s$?

  • A
    $1.91 \times 10^{-2} \ s^{-1}$
  • B
    $4.67 \times 10^{-3} \ mol \ L^{-1} \ s^{-1}$
  • C
    $1.98 \times 10^{-3} \ s^{-1}$
  • D
    $2.07 \times 10^{-2} \ s^{-1}$

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Which of the following is the fastest reaction?

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For the reaction,$3 I_{(aq)}^{-} + S_2 O_{8_{(aq)}}^{2-} \longrightarrow 2 SO_{4_{(aq)}}^{2-} + I_{3_{(aq)}}^{-}$,the rate of formation of $SO_{4_{(aq)}}^{2-}$ is $0.044 \ mol \ dm^{-3} \ s^{-1}$. Calculate the rate of consumption of $I_{(aq)}^{-}$.

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