JEE Main · 2024 · 27 Jan 2024 · Shift 1 · Coordination Compounds

Yellow compound of lead chromate gets dissolved on treatment with hot NaOH solution. The product of lead formed is a :

(A)Tetraanionic complex with coordination number six
(B)Neutral complex with coordination number four
(C)Dianionic complex with coordination number six
(D)Dianionic complex with coordination number four✓ Correct

Answer: (D)

Solution

Yellow

PbCr O_{4}

dissolves in hot, excess NaOH:

PbCr O_{4} + 4NaOH \to N a_{2} [Pb (OH)_{4}] + N a_{2} Cr O_{4}

The lead-containing product

[Pb (OH)_{4}]^{2 -}

carries a

2 -

charge (dianionic) with four

O H^{-}

ligands (coordination number four).

JEE Main · 2024 · 27 Jan 2024 · Shift 1 · Single correct option

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