57. Solving a chemistry problem
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234. Make 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.
K2Cr2O7 HCl → Cl2 CrCl3 KCl H2O
Au HNO3 HCl → AuCl3 NO H2O
K2Cr2O7 HCl → Cl2 CrCl3 KCl H2O
Au HNO3 HCl → AuCl3 NO H2O
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