Question

which metal nitrate gives 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. Thermal decomposition is the term given to splitting up a compound by heating it.

All of these carbonates are white solids, and the oxides that are produced are also white solids.

If "X" represents any one of the elements:



As you go down the Group, the carbonates have to be heated more strongly before they will decompose.

The carbonates become more stable to heat as you go down the Group.

The effect of heat on the Group 2 nitrates

All the nitrates in this Group undergo thermal decomposition to give the metal oxide, nitrogen dioxide and oxygen.

The nitrates are white solids, and the oxides produced are also white solids. Brown nitrogen dioxide gas is given off together with oxygen. Magnesium and calcium nitrates normally have water of crystallisation, and the solid may dissolve in its own water of crystallisation to make a colourless solution before it starts to decompose.

Again, if "X" represents any one of the elements:



As you go down the Group, the nitrates also have to be heated more strongly before they will decompose.

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