Concept:A salt is formed from the neutralisation of an acid by a base; simple oxides are not salts.Explanation:Aluminium oxide, Al2O3, is an amphoteric oxide, not a salt.Sodium hydrogentrioxosulphate (V) is an acidic salt.Sodium trioxocarbonate (V) is a normal salt.Zinc chloride is a normal salt.Answer:A. Aluminium oxide