Which of the following statements are correct?
(I) Both melting and boiling points of H2O are higher than those of H2Te .
(II) In both N2O5 and N2O4 all N−O bond lengths are equivalent.
(III) In both crystalline NaHCO3 and KHCO3.HCO−3 forms only dimeric anion through hydrogen bond.
(IV) B2,C2,N2 on further ionization (removal of single electron) form thermodynamically less stable species.