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a) ….Cu + ….O2 → ….CuO b) ….N2 + ….O2 → ….NO2 c) ….CO2 + ….Pb → ….PbO + ….C d) ….H2 + ….O2 → ….H2O e) ….CO + …..O2 → …CO2 f) ….FeCl2 +…. Na → ….NaCl + ….Fe