Please check. Thank you.

Question

2.
What is the reduction half-reaction for the following unbalanced redox equation?
Cr2O72– + NH4+ Cr2O3 + N2

A.) Cr2O3 -> Cr2O72–
B.) Cr2O72– -> Cr2O3
C.) NH4+ -> N2
D.) N2 -> NH4+

3.
Which oxidation-reduction reactions are best balanced by the half-reaction method?

A.) covalent reactions
B.) acid-base reactions
C.) ionic reactions
D.) intermolecular reactions

Thank You.

Answer 1

what are your answers?

Answer 2

2. B 3. C

Answer 3

wrong, and wrong.

Answer 4

I'm really trying to figure this out. Is it D for number 2 and B for number 3? I know you already explained it once and if i'm wrong, any additional help would be greatly appreciated.