(A) Hydrogen peroxide $(H_2O_2)$ acts as a very weak acid in aqueous solution. The dissociation reaction is: $H_2O_2 \rightleftharpoons H^+ + HO_2^-$.

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(A) Hydrogen peroxide $(H_2O_2)$ acts as a very weak acid in aqueous solution. The dissociation reaction is: $H_2O_2 \rightleftharpoons H^+ + HO_2^-$. The acid dissociation constant $(K_a)$ for $H_2O_2$ is approximately $1.5 \times 10^{-12}$ at $298 \ K$. Therefore,the order of $K_a$ is $10^{-12}$.