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(B) Amphoteric substances react with both acids and bases.$Zn(OH)_2$ acts as an acid when reacting with a base:$Zn(OH)_{2(s)} + 2OH^{-}_{(aq)} \longri

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$1$ and $3$

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(B) Amphoteric substances react with both acids and bases.$Zn(OH)_2$ acts as an acid when reacting with a base:$Zn(OH)_{2(s)} + 2OH^{-}_{(aq)} \longrightarrow [Zn(OH)_4]^{2-}_{(aq)}$ (or $ZnO_2^{2-} + 2H_2O$)$Zn(OH)_2$ acts as a base when reacting with an acid:$Zn(OH)_{2(s)} + 2H^{+}_{(aq)} \longrightarrow Zn^{2+}_{(aq)} + 2H_2O_{(l)}$Therefore,Set $1$ and Set $3$ represent the amphoteric nature of $Zn(OH)_2$.

Which two sets of reactants best represent the amphoteric character of $Zn(OH)_2$?
Set $1$ : $Zn(OH)_{2(s)}$ and $OH^{-}_{(aq)}$
Set $2$ : $Zn(OH)_{2(s)}$ and $H_2O_{(l)}$
Set $3$ : $Zn(OH)_{2(s)}$ and $H^{+}_{(aq)}$
Set $4$ : $Zn(OH)_{2(s)}$ and $NH_{3(aq)}$

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Which two sets of reactants best represent the amphoteric character of $Zn(OH)_2$?Set $1$ : $Zn(OH)_{2(s)}$ and $OH^{-}_{(aq)}$Set $2$ : $Zn(OH)_{2(s)}$ and $H_2O_{(l)}$Set $3$ : $Zn(OH)_{2(s)}$ and $H^{+}_{(aq)}$Set $4$ : $Zn(OH)_{2(s)}$ and $NH_{3(aq)}$