PLEASE I NEED HELP....Hi I have to do half reactions as an oxidation or a reduction, by balancing half eqns.?

Question

Ok for

H2S (aq) --> S(s) acidic I got
**** H2S + e- --> S +2H2

NO3-(aq) --> NO2- (aq) basic I got
**** 2NO3- --> 3NO2-+ 2e-

I-(aq) --> IO3- (aq) acidic I got
****i cant finish this one I2- +3H2) +e- --> IO3-+H2O

Im not sure on the rest either..I might have gotten the last one but im not sure....Please help me

VO2+ (aq) --> V3+ (aq) acidic

Cl2O7 (g) --> ClO2- (aq) basic

NO (g) --> NO3- (aq) acidic

NO2- (aq) --> N2(O2)2- (aq) basic

Se(O3)2- (aq) --> Se(O4)2- (aq) basic
***2e- +4SeO3 --> 3SeO4

Answer 1

You need to balance atoms and charges. You haven't. Go back to your notes on how to do this. No other way.