Укажите реакцию присоединения.
A) Zn+CuCl2 -> Cu+ZnCl2
B) 2H2O -> 2H2+O2
C) Fe+S -> FeS
D) 2HgO -> 2Hg+O2
E) Zn+FeCl2 -> Fe+ZnCl2
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