3.1 Estimate the solubility of calcium Pbl2 at 25C in the presence of 0.10MNal (aq). (6) 3.2 Will BaSO4 precipitate from a solution containing 2.5104MBa+2, barium ion, if enough soluble salt, Na2SO4, is added to make the solution 4.5104MinSO42 ? 3.3 The solubility product of calcium fluoride (CaF2) is 3.451011. If 1.5mL of a 0.10M solution of NaF is added to 130mL of a 1.0105M solution of Ca(NO3)2, will CaF2 precipitate? 3.3 Briefly describe proximate analysis of coal. 3.5 Describe oxidation reaction and use a rust of iron as an example. QUESTION 4 [25] 4.1 Describe the formation of a char coal. Motivate your answer with chemical reactions. 4.2 Give 7 types of biomass thermochemical conversion technologies and explain the differences amongst them as well as examples where possible. 4.2 List three possible disadvantages when a car owner replaces the manufacturer's recommended gasoline with methanol. 4.3 Label and explain in details the following diagram, motivate your answers with chemical equations. Give half cells and the net if necessary (7) 3 4.3.1 Give three fundamental functions of E in the above diagram. (3)