Lead nitrate crystals on heating strongly leave behind a solid residue, which is in ______ colour.

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Solution

Lead nitrate (Pb(NO₃)₂) upon heating results in the formation of lead monoxide (PbO) as yellow colour solid residue, liberates nitrogen dioxide (NO₂) gas which would be reddish-brown in colour, and a colourless gas called oxygen(O₂) gas.
2Pb(NO₃)₂(s) $\overset{heat}{\to}$ 2PbO(s) +4NO₂(g) + O₂(g)
Lead oxide(PbO) formed in the reaction is yellow in colour.
Final answer: Lead nitrate crystals on heating strongly leave behind a solid residue, which is in yellow colour.

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