Chemistry covalent/ionic bond questions? Answer any or all.?

the first section is all true, the 2nd is also true (but i if HgBr2 i molecular or ionic), the 3rd is Mgse=Mg^-2se^+2, FeF3= Fe^-1F3+6, BeBr2=+2, -2, and K3P= -9, =1. the last part is Nitrus oxide, Iron oxide, MagnisiumFluoride, and Litium fluoride