Укажите уравнение окислительно-восстановительной реакции: а) Ca(OH)2 + 2HCl = CaCl2 +2H2O; б) 2H2O2 = O2 + 2H2O; в) KCl + AgNO3 = AgCl + KNO3 ; г) MgO + CO2 = MgCO3.
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