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HClO₂: H=I;Cl=III; O=II
H₄SiO₄: H=I;Si=IV; O=II
HMnO₄: H=I; Mn=VII; O=II
B.
-HClO₃: H=I;Cl=V; O=II
-H₂SiO₃: H=I; Si=IV; O=II