An oxide that combines with water to give an acid is termed:
Acidic oxide: An oxide that exhibits the property of acids is called an acidic oxide.
Thus, Sulphur trioxide reacts with water to produce an acid i.e.; Sulphuric acid.
Question 24. Which of the following statements is not correct ? (a) All metal carbonates react with acid to give a salt, water and carbon dioxide (b) All metal oxides react with water to give salt and acid (c) Some metals react with acids to give salt and hydrogen (d) Some non-metal oxides react with water to form an acid