(Solved): Question 7 [time=1+1+2= 4 minutes] Calcium oxide adopts the rock salt (NaCl) structure in the crys ...

Question 7 [time=1+1+2= 4 minutes] Calcium oxide adopts the rock salt (NaCl) structure in the crystalline state. a) Would CaO have a higher or lower lattice energy than NaCl? Briefly justify your answer. b) With the aid of a chemical equation indicate whether calcium oxide is an acidic oxide, a basic oxide or an amphoteric oxide. c) In an Ellingham diagram, will the line corresponding to CaO have a positive or negative gradient? Justify your answer.