All the given species have the same charge except peroxide.
Charges on ions
- The charge on monohydrogen phosphate is negative because of its formula, [tex][HPO4]^{2-}[/tex].
- The charge on permanganate is negative. The formula is [tex]MnO^-[/tex]
- The charge of oxide ([tex]O^{2-}[/tex]) is negative.
- The charge on peroxide is ( R−O−O−R) is neutral.
- The charge on oxalate, [tex]C2O4^{2-}[/tex], is negative.
Thus, only peroxide is unique.
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