112. Задачка по химии №011 297

201. Based on the oxidation state of phosphorus in the compounds PH3, H3PO4, H3PO3, determine which of them exhibits the properties of only an oxidizing agent, only a reducing agent, and which one can be both an oxidizing agent and a reducing agent. Why? Based on the electronic equations, arrange the coefficients in the reaction equation following the scheme:
HCl CrO3 → Cl2 CrCl3 H2O

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