7. Является реакцией нейтрализации:
а) Fe + 2HCl = FeCl2 + H2,
б) K2O + H2SiO3 = K2SiO3 + H2O;
в) Ca(OH)2 + H2SO4 = CaSO4 + 2H2O;
г) 2Na + 2H2O = 2NaOH + H2.
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