Fill in the electrons on the proper side and state whether it is a reduction or oxidation for ClO2- = ClO3-?

Question

I do not have my book on me, can someone please get me started on these problems? I will give you the first 5 or 7 problems (out of 25!) to get me started, I appreciate any help!

Fill in the electrons on the proper side and state whether it is a reduction or oxidation for the following:

A) ClO2- = ClO3-

B) S = SO2

C) NH3 = NO

D) BrO3- = BrO-

E) HCHO = HCOOH

F) N = NO3-

G) PO4 -3 = P

H) AsO4 -3 = AsO3 -3

Any help will be greatly appreciated!

Answer 1

A) (ClO2) -   => (ClO3)-  & 2e-   oxidation

B) S => SO2  & 4 e-   oxidation

C) NH3 =>   NO  & 5 e-  oxidation

D) (BrO3)-    & 4 e-   =>    (BrO)-  reduction

E) HCHO => HCOOH   & 2 e-    oxidation

F) N =>   NO3-  & 5 e-   oxidation

G) (PO4) -3 & 5 e-  => P     reduction

H) (AsO4) -3   & 2 e-  = (AsO3)  -3    reduction