Сщстфвьте уровнения и укажите тип химических реакций,  протекающей по схеме.

 

а)Cr+O2-Cr203

 

б) Hgo-.....+.......

 

в)CuO+H2-Cu+H2O

 

г)PH3=O2-P2O5+H20

 

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