43. Solving a chemistry problem

43. Solving a chemistry problem

372. The reaction is expressed by the schemes:
NaCrO2 Br2 NaOH = Na2CrO4 NaBr H2O,
NO2 H2O = HNO3 HNO2.
Write electronic equations. Arrange the coefficients in the reaction equations. For each reaction, indicate which substance is the oxidizing agent, which is the reducing agent; which substance is oxidized and which is reduced.

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