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Схеме превращения н → Н соответствует схема реакции:
a) HCl + Zn → H2 + ZnCl2
В)NaH + HCl → H2 + NaCl
Б)NaH + Br2 - NaBr + HBr
г) Н2О2 - H2O + Oz​
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