Ответ:
3Ca + 2H3PO4 → Ca3(PO4)2↓ + 3H2↑
3H2SO4+Cu2O → 2CuSO4+SO2+3H2O
4Al + 3O2 → 2Al2O3
Zn(OH)2 → ZnO + H2O
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Ответ:
3Ca + 2H3PO4 → Ca3(PO4)2↓ + 3H2↑
3H2SO4+Cu2O → 2CuSO4+SO2+3H2O
4Al + 3O2 → 2Al2O3
Zn(OH)2 → ZnO + H2O