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3

The chosen structure and level of theory is not remotely close to a reasonable approximation. You are calculating an anion with charge -2, but there are no polarisation or diffuse functions in STO-3G. Hartree Fock behaves quite poorly, especially for those systems. This is quite obvious when you look at the bond lengths. For lack of time I'll refer to values ...

-1

Remember that formal oxidation state and charge are not the same thing. [UPDATE for clarification: Just because we assign bonds completely to one atom in the assignment of formal oxidation state does not mean we are making a statement about the actual electron distribution. Actual charges on central atoms in high oxidation states are never going to be as ...

2

The disproportionation rection of $\ce{HIO}$ cannot produce $\ce{HIO3}$ and $\ce{HI}$ (or $\ce{I^-}$ ions) in acidic solution. The reason is that $\ce{I^-}$ and $\ce{IO3^-}$ ions do react with one another, if $\ce{H^+}$ ions are present, to give : $$\ce{IO3^- + 5 I^- + 6 H^+ -> 3 I2 + 3 H2O}$$ If no ion $\ce{H^+}$ is present, the previous reaction does ...

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