State two relevant observations for Lead nitrate crystals are heated in a hard glass test tube?

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Solution

When lead nitrate is heated it decomposes in to lead oxide(PbO), Nitrogen dioxide(NO₂), and oxygen gas(O₂)
When lead nitrate crystals are heated strongly, a reddish-brown colored gas is released.
2Pb(NO₃)₂ (s) $\overset{heat}{\to}$ 2PbO (s) + 4NO₂(g) + O₂(g)
The gas produced is nitrogen dioxide(NO₂).
This gas has an irritating odour.
This is a thermal decomposition reaction.

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