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- ZnO ; Cu(OH)2 ; Cu ; CuSO4 ; C2H5OH
- CuO ; Ba(OH)2 ; Zn ; Na2CO3 ; C2H5OH
- Ag ; Cu(OH)2 ; ZnO ; H2SO4 ; C2H5OH
- H2SO4 ; Cu(OH)2 ; C2H5OH ; C6H6 ; CaCO3