What are the oxidizing agents, and the reducing agents for 2Na (aq) + 2H2O (l) →2NaOH (aq) + H2 (g)

C (s) + O2 (g) →CO2 (g)

2MnO-4 (aq) + 5SO2 (g) + 2H2O (l) →2Mn2 + (aq) + 5SO2-4 (aq) + 4H + (aq)

1.) 2Na (aq) + 2H2O (l) →2NaOH (aq) + H2 (g),

Na is oxidizing agent and H is reducing agent.

2.) C (s) + O2 (g) →CO2 (g)

C is an oxidizing agent

3.) 2MnO-4 (aq) + 5SO2 (g) + 2H2O (l) →2Mn2 + (aq) + 5SO2-4 (aq) + 4H + (aq)

Mn is reducing agent and S is oxidizing agent.