1. (i) What is the colour of the flame when sulphur burns in air?   2. (ii) Name the product formed when sulphur is burnt in air or oxygen.   3. (iii) When burning sulphur reacts with water, a compound is formed. Name the compound.   4. (iv) Write the balanced equation for the reaction between sulphur dioxide and moist chlorine.   5. (v) In the reaction mentioned in question (iv) above, which substance is the oxidising agent?