Choose from the following compounds to answer the questions below. BaCl2 C2H4 C3H4 C3H8 CO CO2 K2SO4 Na3PO4 SO2 ZnSO4 Each of these compounds can be used once, more than once or not at all. Give a compound which

1. (a)is an acidic atmospheric pollutant from volcanic eruptions,[1]
2. (b)is a saturated hydrocarbon,[1]
3. (c)dissolves in water to form an aqueous solution which gives a white precipitate on addition of aqueous sodium hydroxide,[1]
4. (d)reduces iron(III) oxide to iron in the blast furnace,[1]
5. (e)contributes to the process of eutrophication.[1]