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It turns to a brownish color and smokes
No it would not. Al2O3 is very stable, and will not decompose
The decomposition temperature depends on the compound. But many organic compounds do decompose on heating.
Mercuric oxide decomposes upon heating to give off mercury and oxygen.
this is because it does not decompose by heating
Aluminum oxide will not decompose readily upon heating because it is a very stable oxide. Aluminum oxide is passive and is less affected by environmental factors.
It`s pressure rises continual heating will cause it to decompose.
Probable because the ion ammonium has covalent bonds.
because it is a salt with little energy capabilty to react.
I think it won't decompose on heating because of its stability to heat and the nature of bond formed between sodium and trioxocarbonate (IV) ion which could also be a function of it position in the activity series.