12. Which of the following five compounds have both ionic and covalent bonds? I AlCl3 SrF III CH2Cl2 IV. Na2S04 V. C60 (a) I only (b) II and III (c) IV only d) II and V (e) I, II, III, and V 13. Which of the following oxides forms a base when dissolved in water? (a) CaO (b) P2Os (c) H202 (d) CO2 (e) SO2