Activity 1.6 Ncert Science class 10
Procedure: The question asks to heat an aqueous solution of lead nitrate into a test tube and see what happens.
Observation: A yellow precipitate of lead oxide form with the evolution of brown nitrogen dioxide gas which has an irritating smell.
Inference: Lead nitrate decomposes to lead oxide which is yellow. Nitrogen dioxide gas is liberated which has a brown colour and irritating smell.
2Pb(NO3)2(s) ---------> 2PbO(s) + 4NO2(g) + O2(g)
Lead nitrate Heat Lead oxide Nitrogen oxide Oxygen