When crystals of lead nitrate are heated strongly in a dry test tube
Crystals immediately melt
A brown residue is left
CaO
CaCO3
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Lead nitrate ,when heated strongly in a dry test tube, it produces Lead oxide(PbO) , Nitrogen dioxide( NO2) and oxygen(O2). The lead nitrate is found to turn yellow due to the resultant product- lead oxide(PbO) and also there is evolution of a reddish brown gas which is nitrogen dioxide
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