+ +6 - 2. + +4 - 2. +4 - 2. +2 - 2. ++5-2
H2SO4. ; NACO3. ; SO2 ; CuO. ; HPO3;
+3-2
P2O3
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+ +6 - 2. + +4 - 2. +4 - 2. +2 - 2. ++5-2
H2SO4. ; NACO3. ; SO2 ; CuO. ; HPO3;
+3-2
P2O3