Find the oxidation of number is Al in AL2O3

1)Reaction of strong base and acidic salt

2)Reaction of acid and base

Explanation:

1)  Ammonium carbonate is basically a acidic salt in nature. When it comes in contact of strong base it behave as strong acid and dissociate. Ammonium ion give i's H+ to NaOH and release ammonia gas and water. H2O react with left carbonate ion to form sodium carbonate.

2)  Phosphoric acid is tri basic acid and calcium hydroxide is a base and reacts to form salt and water as side product.