Прошу помогите. За спам жалоба
Укажите два примера реакций обмена:
1) CuCl2 + 2NaOH → Cu(OH)2 + 2NaCl
2) Fe2O3 + 3Mg → 3MgO +2Fe
3) 4Al + 3O2→ 2Al2O3
4) CaCO3 → CaO + CO2
5) Al(OH)3 + 3HCl→ AlCl3 + 3H2O
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