Solution of problem 623 of the collection on general ch

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623. Indicate which hydrazine N2H4 serves as an oxidizing agent in which of the above reactions, and in what - as a reducing agent:
N2H4 + 4AgNO3 + 4KOH = N2 + 4Ag + 4KNO3 + 4H2O
N2H4 + Zn + 2KOH + 2H2O = 2NH3 + K2 [Zn (OH) 4]


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