Question

Choose the correct answer form the alternatives given.
The normal oxide contains __________ ion, peroxide contains __________ ion and superoxide contains __________ ion.

• A. $O^{2-},O_2^{2-},O_2^{-}$
• B. $O^{2-},O_2^{-},O_2^{2-}$
• C. $O^{-},O^{2-},O^{3-}$
• D. $O^{-},O^{2-},O_2^{2-}$

Answer 1

The correct option is A $O^{2-},O_2^{2-},O_2^{-}$

the normal oxides contain $O^{2-}$ while peroxide contains $O_2^{2-}$ ion and superoxide contain $O_2^{-}$ ions.

In normal oxides, the oxygen has oxidation number $-2$ while in peroxide each oxygen have oxidation number of $-1$ and in superoxide the oxidation number of oxygen is $\frac{-1}{2}$.