What do you observe? When
(a) Lead nitrate is heated.

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Solution

On heating, lead nitrate decomposes to give a yellow residue of Lead oxide and brown nitrogen dioxide along with evolution of oxygen gas. That is, $2 P b {({N O}_{3})}_{2} Δ \to 2 P b O + 4 {N O}_{2} + O_{2}$ It is a thermal decomposition reaction.
PbO - yellow solid
${N O}_{2}$ - brown gas
$O_{2} -$ colourless gas

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