106. Solving a chemistry problem
49. Based on the oxidation state of sulfur, iodine and chromium in the compounds H2SO3, KI, K2Cr2O7, determine which of them is only an oxidizing agent, only a reducing agent, and which one can exhibit both oxidizing and reducing properties. Why? Based on the electronic equations, arrange the coefficients in the reaction equation following the scheme
PbO2 NaOH NaCrO2 → H2O Na2CrO4 Na2PbO2
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