35. (i) Name the oxide of sulphur which reacts with water to give sulphuric acid.   36. (ii) In the Contact Process, the direct reaction between the oxide of sulphur and water is avoided. In this process, what does the oxide of sulphur react with instead of water and what is the name of the product?   37. (iii) Give the name and formula of the acid salt which can give sodium ions and sulphate ions in solution.