Question

After heating pb(no3)2 at673k the brown gas is of

Answer 1

I think it's Nitrogen !!!!!!!!!!!!!!!!!!!!

Answer 2

on heating lead nitrate,it undergoes thermal decomposition and it gives a brown fume of nitrogen dioxide,oxygen gas and a yellow residue of lead oxide  is left behind.when the evolved gas is passed over wooden glowing splinters it rekindles.This show the presence of oxygen gas

2Pb(NO3)2⇒2PbO+4NO2+O2