September 2021 0 17 Report
Какое уравнение соответствует реакции обмена? Укажите правильный вариант ответа:
1. CaO + CO2 = CaCO3
2. 2 N a + 2H 2O = 2 NaOH + H2
3. 2Fe(OH)3 = Fe2O3 + 3H2O
4. FeCl2 + 2NaOH = Fe(OH)2 + 2NaCl
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