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Chemistry

State one observation for the following : Lead nitrate is heated strongly in a test tube.

Practical Chemistry

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Answer

White crystalline solid turns buff yellow on heating, gives crackling sound, melts and fuses with the glass. Nitrogen dioxide (reddish brown) and Oxygen (colourless) gases are evolved.

2Pb(NO3)2[lead nitrate (white)]Δ2PbO[litharge - buff yellow]+4NO2[Nitrogen dioxide]+O2[Oxygen]\underset{\text{[lead nitrate (white)]}}{2\text{Pb(NO}_3)2} \overset{\Delta}{\longrightarrow} \underset{\text{[litharge - buff yellow]}}{2\text{PbO}} + \underset{\text{[Nitrogen dioxide]}}{4\text{NO}_2} + \underset{\text{[Oxygen]}}{\text{O}_2}

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