Осуществить превращение:
1)Н2О2 -> О2 -> SO2
2) O2-> SO2
3)HgO-> O2 -> P2O5
4)KMgO4 -> O2 -> CuO -> Cu
5)H2O2-> O2-> Fe3O4->Fe
6)HCl->H2->H2O->O2->Fe2O3->Fe
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