Ответы на вопрос:
1) 2fe + 6hcl = 3h₂ + 2fecl₃
2)ca + 2h₂o = ca(oh)₂ + h₂
3)pbo₂ + h₂ = pbo + h₂o
4)al₂o₃ + 3h₂ = 2al + 3h₂o
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