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In which of the following salts, only cationic hydrolysis is involved?
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$\mathrm{NH}_4 \mathrm{Cl}$
Dissolution $\mathrm{NH}_4 \mathrm{Cl} \rightarrow \mathrm{NH}_4^{+}+\mathrm{Cl}^{-}$
$\mathrm{Cl}^{-}$will form $\mathrm{Cl}^{-}$(aq) and will not undergo hydrolysis.
Hydrolysis $\mathrm{NH}_4^{-}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{NH}_3+\mathrm{H}_3 \mathrm{O}^{+}$
$\mathrm{Cl}^{-}$will form $\mathrm{Cl}^{-}$(aq) and will not undergo hydrolysis.
Hydrolysis $\mathrm{NH}_4^{-}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons \mathrm{NH}_3+\mathrm{H}_3 \mathrm{O}^{+}$
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