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Displacement Reactions

A colourless ...

Question

A colourless lead salt, when heated, produces a yellow residue and brown fumes.
Name the lead salt.

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Solution

On heating lead nitrated it forms lead oxide & brown coloured nitrogen dioxide $(N O_{2})$ gas.
So, the colourless compound is lead nitrate.
$2 P b (N O_{3})_{2} Δ - \to 2 P b O + 4 N O_{2} + O_{2}$

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