Diamond is the hardest mineral known. It is composed of 100% carbon, meaning it cannot 'decompose' in the classic sense where an object's different elements separate from each other.
You can heat a diamond to:
and at that height heat the diamond will melt.
Yes
Mercuric oxide decomposes upon heating to give off mercury and oxygen.
Probable because the ion ammonium has covalent bonds.
because it is a salt with little energy capabilty to react.
Diamonds don't melt. In air they burn. Without air they decompose forming graphite.
Yes
Yes
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.
because it is a salt with little energy capabilty to react.
Probable because the ion ammonium has covalent bonds.
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.
Diamonds don't melt.