3. Визначте ступені окиснення кожного елемента у сполуках: Н2, HCl, Н2S, CaO, CO2, Р2O5,
SO3,CaCO3, Н2CO3, NaNO3,NaНSO4, FeSO4, Ba3(РО4)2, К3РО4, Ba(Н2РО4)2.
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