oxidation number of molecules and ions

[yon]

could u plz help me find out the oxidation number for all of these molecules and ions
thanx!!!!

(c) IF₇
(d) NaIO₃

(e) C₂H₂
(f) KAuCl₄
(g) Li₂
(h) Cs₂O

(i) PF₆-
(j) K₂CrO₄
(k) KMnO₄
(l) NaHCO₃

(m) ClF
(n) K₂Cr₂O₇

[vhpk]

Remember all the molecules have the neutralization about charge, so their oxidization number are 0, the oxidization of ions are their charge, so u can see with PF₆-, its oxidization number is 1-.