Identify the cation for the reaction NH₄OH solution when added to the solution (B) gives white precipitate which does not dissolve in excess?

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Solution

When Lead nitrate(Solution B) reacts with ammonium hydroxide(NH₄OH), a white gelatinous precipitate is formed which is insoluble in excess of ammonium hydroxide.
Pb(NO₃)₂(aq)+ 2NH₄OH (aq)⇢ Pb(OH)₂ ⇣+ 2NH₄NO₃(aq)
The white gelatinous precipitate is Lead hydroxide which is insoluble in excess of Ammonium hydroxide.
The cation present is Pb²⁺

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