See Answer
1: (c) Chemical reaction, 2: (d) All of these, 3: (a) Change in chemical property, 4: (b) Atoms are rearranged, 5: (c) Ferric oxide, 6: (a) Fe2O3, 7: (a) Oxidation, 8: (a) Moist air, 9: (b) Calicium oxide, 10: (a) CaO, 11: (d) Calcium hydroxide, 12: (b) CaOH, 13: (c) Calcium carbonate, 14: (a) CaCO3, 15: (a) Oxidation, 16: (b) Endothermic, 17: (b) Exothermic, 18: (b) Endothermic, 19: (a) Endothermic, 20: (a) Endothermic