ОВР.
Пожалуйста обьясните каждый шаг и напишите подробно.

[tex]H2 + CA = CaH2[/tex]
[tex]CuO + H2 = Cu + H2O[/tex]
[tex]H2 + S = H2S[/tex]
[tex]2H2 + O2 = 2H2O[/tex]


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