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Answer:
a. Cl2(aq) + 2Br-(aq) → 2Cl-(aq) + Br2(aq)
Oxidizing agent: Cl2
Reducing agent: Br-
b. PbS(s) + O2(g) → PbO(s) + SO2(g)
Oxidizing agent: O2
Reducing agent: PbS
c. Cl2 + 2NaBr → 2NaCl + Br2
Oxidizing agent: Cl2
Reducing agent: Br-
d. MgO + H2O → Mg(OH)2
In this reaction, neither MgO nor H2O are being oxidized or reduced. It is a neutralization reaction between the basic oxide MgO and water to form the basic hydroxide Mg(OH)2.