Assign oxidation numbers to all the elements in each of the following reactions, and identify the reactant that is oxidized, the reactant that is reduced, the oxidizing agent, and the reducing agent:
a. 4Al(s) +3O2(g)→ 2Al2O3(s)
b. I2O5(s) +5CO(g) → I2(g) + 5CO2(g)
c. 2Cr2O3(s)+ 3C(s) → 4Cr(s) + 3CO2(g)
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