3. IDENTIFY the following reactions as Oxidation / Reduction reactions ? a) PbO + H2 --> Pb + H2O
b) ZnO + C --> Zn + CO
c) H2S + Cl2--> 2HCl + S
d) Fe203 + 3C0 --> 2Fe + 3CO2
e) PbS + 4H202 --- PbSO4 + 4H2O

a) Is reduction AND oxidation
[ Reduction: since there is a loss of oxygen in Pb]
[Oxidation: since there is a gain of oxygen in H2O]

b) Reduction AND oxidation
[Reduction: since there is a loss of oxygen in Zn]
[Oxidation: since there is gain of oxygen in CO]

c) Oxidisation AND reduction
[Oxidisation: since there is a loss of electrons in S]
[Reduction: since there is a gain of electrons in Cl^-1]

d)Reduction AND oxidation
[Reduction: since there is a loss of oxygen in 2Fe]
[Oxidation: since there is a gain of oxygen in 3CO2]

e) Oxidation AND Reduction
[Oxidation: since there is a gain of oxygen in PbSO4]
[Reduction: since there is a loss of oxygen in 4H2O]

( Hope this was helpful... And I apologize if any of the answers are incorrect I just did this chapter as well!)

Remember: Oxidation requires—Gain of O2
—Loss of H2
—Loss of elections

Reduction requires—loss of O2
—Gain of H2
—gain of electrons