(a) (i) What is meant by delocalized charge? (2 marks) (ii) Give all possible Lewis structures for the phosphate ion, PO43. Would you expect all PO bonds in the phosphate ion to be of the same length? Explain your answer. (6 marks) (b) Predict the electron-group geometry, molecular geometry and bond angle(s) for each of the following two molecules. Show the steps by which you arrived at the answer. (i) NO2 (ii) XeF4 (6 marks) (c) With the valence bond method using hybridized atomic orbitals, describe in detail the bonding scheme in the HCOOH molecule (see below for the Lewis structure of this molecule)