6. Solving a chemistry problem
119. Reactions are expressed by schemes
a) Au HCl HNO3 = NO H2O AuCl3
b) HCl K2Cr2O7 = KCl H2O Cl2 CrCl3
Write electronic equations. Arrange the coefficients in the reaction equations. For each, indicate which substance is the oxidizing agent and which is the reducing agent; which substance is oxidized and which is reduced.
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