1) NH4NO3-> NH3-> NO-> NO2-> NH4NO2-> NH4NO3-> N2O
2) Ca3(PO4)2-> P-> PH3-> H3PO4-> Ca(H2PO4)2-> Ca3(PO4)2-> CaHPO4
3) FeS-> H2S-> SO2-> NaHSO3-> BaSO3-> BaSO4-> BaS
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