Al2O3--->X--->AL(OH)3--->Al2O3

 

Si--->SiO2--->X--->H2SiO3

 

Zn--->X---->Zn(OH)2--->ZnO

 

MgO-->Mg(No3)2--->X--->Mgcl2

 

Fe2O3-->Fe2(So4)3--->X-->Fe2O3

 

CuSo4--->Cu(OH)2--->X--->Cu

помогите вообще не понимаю как это делать

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