1. (i) This gas can be oxidized to sulphur.   2. (ii) This gas decolourises potassium permanganate solution.   3. (iii) When this gas is bubbled through copper sulphate solution, a deep blue coloured solution is formed.   4. (iv) This gas gives a white precipitate when reacted with silver nitrate solution acidified with dilute nitric acid.   5. (v) This gas burns in oxygen with a green flame.   6. (vi) This gas can be obtained by the reaction between copper and concentrated sulphuric acid.