The correct increasing order of acidity is

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(B) To determine the acidity,we compare the dissociation constants or the stability of the conjugate bases.$H_2O$ is a very weak acid with a $pK_a$ of

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$H_2O < H_2O_2 < CO_2$

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(B) To determine the acidity,we compare the dissociation constants or the stability of the conjugate bases.$H_2O$ is a very weak acid with a $pK_a$ of approximately $15.7$.$H_2O_2$ is a stronger acid than $H_2O$ due to the inductive effect of the oxygen atom,with a $pK_a$ of approximately $11.6$.$CO_2$ in water forms carbonic acid $(H_2CO_3)$,which is a stronger acid than $H_2O_2$,with a $pK_a$ of approximately $6.35$.Therefore,the increasing order of acidity is $H_2O < H_2O_2 < CO_2$.

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