Solution of task 228 of Chemistry Book Shimanovich 2003

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228. On the basis of the degree of oxidation of chromium, iodine and sulfur in compounds K2Cr2O7, KI and H2SO3, determine; Which of them is only an oxidizing agent, 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:
NaCrO2 + PbO2 + NaOH-Na2CrO4 + Na2PbO2 + H2O

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