QJEEM23Chab57: JEE Main 2023 Chemistry - Class 12 JEEM23Chab57 Solution: Formation of which complex, among the following, is not a…

A confirmatory test for $Pb^{2+}$ ions involves the formation of a specific compound that indicates the presence of lead ions in a solution.

Let's go through the options:

Option A: Lead chromate ( $\mathrm{PbCrO}_4$ ) forms a yellow precipitate, which is a confirmatory test for $Pb^{2+}$ ions.

Option B: Lead iodide ( $\mathrm{PbI}_2$ ) forms a yellow precipitate, which is a confirmatory test for $Pb^{2+}$ ions.

Option C: Lead sulfate ( $\mathrm{PbSO}_4$ ) forms a white precipitate, which is a confirmatory test for $Pb^{2+}$ ions.

Option D: Lead nitrate ( $\mathrm{Pb(NO_3)_2}$ ) is soluble in water and does not form a precipitate under normal conditions. Thus, its formation is not used as a confirmatory test for $Pb^{2+}$ ions.

So, the correct answer is Option D: lead nitrate.