2. What is the reduction half-reaction for the following unbalanced redox equation?

Question

Cr2O72– + NH4+ Cr2O3 + N2

A.) Cr2O3 -> Cr2O7^2–
*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

2. b

Answer 2

3. is correct