262. Make electron-ion schemes and molecular equations of reactions. Specify the oxidizing agent and reducing agent. Two reactions (a, b) for each task.
a) Cr2(SO4)3 Cl2 KOH * CrO4 2- , Cl -
b) K2Cr2O7 Na2SO3 H2SO4 * SO4 2—, Cr 3

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