Помогите с химией ,пожалуйста.


К ОВР относится

(выберите один вариант)


1) SO3 + H2O = H2SO4


2) CO2 + C = CO


3) NaOH + HCl = NaCl + H2O


4) 3Na2O + P2O5 = 2Na3PO4
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