Question

which metal nitrate give colourless gas on Thermal decomposition

Answer 1

The effect of heat on the Group 2 carbonates. All the carbonates in this Group undergo thermal decomposition to give the metal oxide and carbon dioxide gas.

Answer 2

The Group 2 nitrates undergo thermal decomposition to the metal oxide, ... to make a colorless solution before it starts to decompose. The Group 2 nitrates undergo thermal decomposition to the metal oxide, ... to make a colorless solution before it starts to decompose.