Solution of task 232 of Chemistry Book Shimanovich 2003

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232. Reactions are expressed by schemes:
NaCrO3 + Br2 + NaOH-Na2CrO4 + NaBr + H2O
FeS + HNO3 - Fe (NO3) 2 + S + NO + H2O
Compose electronic equations. Arrange the coefficients in the reaction equations. For each reaction, indicate which substance is an oxidizer, which is a reducing agent; What substance is oxidized, what is recovered.

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