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Question

Lead Acetate when reacts with `A', gives black ppt

A

PbCl2

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B

PbCO3

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C

PbCrO4

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D
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Solution

The correct option is D
Try to recall the properties of Lead acetate.
When H2S gas is passed through the solution of (CH3COO)2Pb, black ppt. of PbS is formed.
(CH3COO)2Pb+H2S2CH3COOH+PbS­
Black ppt.
But,
With potassium chromate K2CrO4:
(CH3COO)2Pb+K2CrO4PbCrO4­+2CH3COOK
Lead chromate
(yellow ppt.)
On addition of HCl in (CH3COO)2Pb solution, white ppt of PbCl­2­ is formed in cold conditions, which dissolves on heating. On cooling, PbCl­2 reaooears as a white crystalline solid.
(CH3COO)2Pb+2HClPbCl2+2CH3COOH
dilLead chloride
(white ppt).
and same with NaHCO3,
(CH3COO)2Pb+2NaHCO3PbCO3+2CH3COONa
(white ppt)

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