Question

Which substance can be decomposed by chemical change?

1)ammonia
2)aluminum
3)magnesium
4)maganese

Answer 1

Answer: 1) ammonia

Step-by-step explanation:

Decomposition is usually only possible for compounds and of all the options, AMMONIA (Option 1) is the only compound (the other options are elements).

The decomposition of ammonia is a mildly endothermic process, yielding hydrogen and nitrogen gas:

2NH₃ → N₂ + 3H₂