1. H₂S, CO, CO₂. Al₂O₃, P₂O₅, Na₂O
2. IV I III II II II I II V II
CH₄, Fe₂O₃, CuO. Na₂O, P₂O₅
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1. H₂S, CO, CO₂. Al₂O₃, P₂O₅, Na₂O
2. IV I III II II II I II V II
CH₄, Fe₂O₃, CuO. Na₂O, P₂O₅