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a. Balance the following redox reaction by the oxidation number method: CuO+NH3 Cu+ H2O + N2 B. Balance the following redox reaction, which takes place

a. Balance the following redox reaction by the oxidation number method:

CuO+NH3 Cu+ H2O + N2

B. Balance the following redox reaction, which takes place in a basic solution using the half-reaction method:

Cr2O7 2- + Hg Hg2+ + Cr3+

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