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Double Displacement Reaction

A colourless ...

Question

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

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Solution

The chemical equation of the reaction is
$P b (N O_{3})_{2} Δ - \to 2 P b O + 4 N O_{2} + O_{2} Brown fumes$
Lead nitrate on heating produces brown fumes of nitrogen dioxide.

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