The reactions in which the equilibrium constant is called acidity constant

(A)$2{\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{OH}}^{-}$                               (B) ${\mathrm{H}}_2\mathrm{S}+{\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{HS}}^{-}$

(C) ${\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{CH}}_3{\mathrm{NH}}_2\rightleftharpoons {\mathrm{H}}_3{\mathrm{CNH}}_3^{+}+{\mathrm{H}}_2\mathrm{O}$         (D)   ${\mathrm{HNO}}_2+{\mathrm{H}}_2\mathrm{O}\rightleftharpoons {\mathrm{H}}_3{\mathrm{O}}^{+}+{\mathrm{NO}}_2^{-}$

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