Correct: MgO, ZnO, FeO, Fe2O3, Al 2 O 3, Cr 2 O 3, Na 2 O, K 2 O, Li 2 O, Cu 2 O, CaO, SnO, Incorrect: Cl 2 O 3, N 2 O 3, P 4 O 10, CO 2, CO 3, SO 3, SO 2, H 2 O ,

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