6. What is the oxidation number of S in S2O3^2-?
- +6
- +4
- +2
7. What type of reaction is this? Fe3+ + e- --> Fe2+
- reduction
- oxidation
8. Is chlorine acting as the oxidising or reducing agent in this reaction? Cl2 + 2I- --> I2 + 2Cl-
- oxidising agent
- reducing agent
9. Fill in the missing number: MnO4- + 8H+ ?e- --> Mn2+ + 4H2O
- 8
- 5
- 4
10. What is the oxidation number of Mn in MnO4-?
- +8
- +5
- +3
