Схема, являющаяся уравнением химической реакции:

А.Al2S3 + 6H2O-->2Al(OH)3 + 3H2S.

Б.2Al + O2--->Al2O3.

В.Ca + HCl--->CaCl2 + H2.

Г.Mg + O2---> MgO. 

помогите) 

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