From the following reactions, identify the reactants that undergo oxidation and reduction:

a. Fe + S → FeS
→ In the above reaction, Fe undergoes oxidation and S undergoes reduction. [Fe is giving two electrons which are accepted by S.] 1 Mark
b. 2Ag2O → 4Ag + O2
→ In the above reaction, Ag2O undergoes reduction and Ag undergoes oxidation. 1 Mark
c. 2Mg + O2 → 2MgO
→ In the above reaction, Mg is getting oxidised. 1 Mark
d. NiO + H2 → Ni + H2O
→ In the above reaction, NiO is getting reduced while Hydrogen is getting oxidised. 1 Mark