Question

$\text{O}_{2}^{2-}$ is the symbol of...... ion.

• A. oxide
• B. super oxide
• C. peroxide
• D. monoxide

Answer 1

Answer: (C)

peroxide

Answer 2

The symbol ${{O}^{2-}}$ is known as oxide ion. The symbol $O_{2}^{-}$ is known as super oxide because its oxidation state is $-\frac{1}{2}.$ The symbol $O_{2}^{2-}$ is known as peroxide ion because oxidation state of oxygen in $\text{O}_{2}^{2-}$ is $-1.$