Question

which metal nitrate gives colourless gas on Thermal decomposition?
A- NaNo3
B- Cu(NO3)2
C- Ba(NO3)2
D- Hg(NO3)2

Answer 1

Ba(NO3)2
= metal nitrate gives colourless gas on Thermal decomposition

Answer 2

Ba(NO3)2 gives Nitric oxide which is colourless in nature on thermal decomposition.While the others give nitrogen dioxide on being decomposed. Nitrogen dioxide is reddish brown in nature. Ba(NO3)2 decomposes to BaO2 and hence nitric oxide is formed.