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Which of the following reactions are oxidation-reduction reactions? W. Pb2+(aq) + 2I-(aq) → PbI2(s) X. Na2O(s) + H2O(l) → 2NaOH(aq) Y. PCl3(g) + Cl2(g) → PCl5(g) Z. CaCO3(s) → CaO(s) + CO2(g)