Solution of problem 623 of the collection on general ch

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If the total amount of your purchases from the seller Михаил_Перович more than:
- 20383 ₽ the discount is 15%
- 10191 ₽ the discount is 10%
- 5096 ₽ the discount is 7%
- 2038 ₽ the discount is 5%
- 1019 ₽ the discount is 3%
- 510 ₽ the discount is 2%
- 102 ₽ the discount is 1%

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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]