15. Solving a chemistry problem
107. Based on the electronic equations, arrange the coefficients in the equation for the reaction following the scheme:
HNO3 + PbS → NO + Pb(NO3)2 + H2O + S.
Based on the oxidation state of phosphorus in the compounds PH3, H3PO4, H3PO3, determine which of them is only an oxidizing agent, only a reducing agent, and which of them can exhibit both oxidizing and reducing properties. Why?
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