Which ion will not be precipitated by aqueous | vedclass

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(D) Aqueous $(NH_4)_2S$ provides $S^{2-}$ ions. $Al^{3+}$ is precipitated as $Al(OH)_3$ due to hydrolysis: $2Al^{3+} + 3S^{2-} + 6H_2O \longrightarrow

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$K^{+}$

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(D) Aqueous $(NH_4)_2S$ provides $S^{2-}$ ions. $Al^{3+}$ is precipitated as $Al(OH)_3$ due to hydrolysis: $2Al^{3+} + 3S^{2-} + 6H_2O \longrightarrow 2Al(OH)_3 \downarrow + 3H_2S \uparrow$. $Pb^{2+}$ and $Cu^{2+}$ form insoluble metal sulfides: $Pb^{2+} + S^{2-} \longrightarrow PbS \downarrow$ and $Cu^{2+} + S^{2-} \longrightarrow CuS \downarrow$. $K^{+}$ salts are generally soluble in water,so $K_2S$ remains in the solution.

Which ion will not be precipitated by aqueous $(NH_4)_2S$?

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