1. Which of the following ions have noble gas configurations- Fe2+, Fe3+, Sc3+, Co3+?
a. Sc3+
b. Co3+ and Fe3+
c. Fe2+
d. None of the them
e. Fe3+
2. Rank the following from most polar to least polar: N2, HF, HCN, H2O
a. N2, HCN, H2O, HF
b. HF, H2O, HCN, N2
c. H2O, N2, HCN, HF
d. HF, HCN, N2, H¬2O
e. H¬2O, HF, HCN, N2