JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Practical and Analytical Chemistry

Formation of which complex, among the following, is not a confirmatory test of

Pb^{2 +}

ions

(A)lead chromate
(B)lead iodide
(C)lead nitrate✓ Correct
(D)lead sulphate

Answer: (C)

Solution

Confirmatory tests for

Pb^{2 +}

ions rely on the formation of colored or insoluble precipitates. Lead chromate (yellow), lead iodide (yellow), and lead sulphate (white) are all insoluble and form characteristic precipitates. However, lead nitrate

Pb (NO_{3})_{2}

is a soluble, colorless compound and does not form a precipitate, so it cannot be used as a confirmatory test.

JEE Main · 2023 · 06 Apr 2023 · Shift 2 · Single correct option

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