Formation of which complex, among the following, is not a confirmatory test of Pb2+ ions
(1) lead sulphate

(2) lead nitrate
(3) lead chromate
(4) lead iodide

Answer: Option 2
Explanation: 1. Lead sulphate: When a solution containing Pb2+ ions is mixed with sulphate ions (SO42-), lead sulphate (PbSO4) is formed as a yellow precipitate. The formation of lead sulphate is a confirmatory test for the presence of Pb2+ ions.
2. Lead nitrate: Lead nitrate (Pb(NO3)2) is a soluble salt. While the addition of nitrate ions can help in the detection of certain other metal ions, the formation of lead nitrate itself does not serve as a confirmatory test for Pb2+ ions.
3. Lead chromate: When a solution containing Pb2+ ions is mixed with chromate ions (CrO42-), lead chromate (PbCrO4) is formed as a yellow precipitate. The formation of lead chromate is a confirmatory test for the presence of Pb2+ ions.
4. Lead iodide: When a solution containing Pb2+ ions is mixed with iodide ions (I-), lead iodide (PbI2) is formed as a yellow precipitate. The formation of lead iodide is a confirmatory test for the presence of Pb2+ ions.
It’s important to note that the solubility or insolubility of the compounds formed plays a crucial role in confirmatory tests. The formation of insoluble compounds indicates the presence of Pb2+ ions.

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