Определите степень окисления каждого элемента в следующих веществах:
BaCO3
H2S
KMnO4 Na
Al2(SO4)3
NaNO3
HClO4
K2MnO4
Cl2
Ca3(PO4)2
Mg(NO2)2
Cr2O3
Na2MnO4
H2SiO3
H2SO4
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