Solution of task 224 of Chemistry Book Shimanovich 2003

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224. Based on the degree of oxidation of phosphorus in the compounds PH3, H3PO4, H3PO3, determine which of them is only an oxidizer, only a reducing agent and which can exhibit both oxidizing and reducing properties. Why? On the basis of the electronic equations, arrange the coefficients in the reaction equation, following the scheme:
PbS + HNO3 - S + Pb (NO3) 2 + NO + H2O


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