Помогите, пожалуйста
NO₂->Х->Y->NaNO₂
Какие тут X и Y?
1) Х-N₂ и Y-NO₂
2) Х-NH₃ и Y-N₂
3) Х-HNO₂ и Y-KNO₂
4) Х-HNO₃ и Y-NaNO₃
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