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ICSE Class 10 Chemistry Question 35 of 42

Practical Chemistry — Question 36

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Question

Question 1(2019)

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

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}