Установите соответствие между уравнением реакции и элементом-восстановителем в нем

А. [tex]2NH_{3}[/tex] = [tex]N_{2}[/tex] + [tex]3H_{2}[/tex]
Б. 3CuO + [tex]2NH_{3}[/tex] = 3Cu + [tex]N_{2}[/tex] + [tex]3H_{2}O[/tex]
В. 2P + [tex]5N_{2}O[/tex] = [tex]5N_{2}[/tex] + [tex]P_{2}O_{5}[/tex]

Элемент - восстановитель

1. [tex]N^{0}[/tex]
2. [tex]N^{-3}[/tex]
3. [tex]O^{-2}[/tex]
4. [tex]N^{+1}[/tex]
5. [tex]P^{0}[/tex]

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