Solution of task 234 of Chemistry Book Shimanovich 2003

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234. Reactions are expressed by schemes:
K2Cr2O7 + HCl-Cl2 + CrCl3 + KCl + H2O
Au + HNO3 + HCl-AuCl3 + 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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