Question

$O_2^{2-}$ IS THE SYMBOL OF:
A. Oxide ion
B. Superoxide ion
C. Peroxide ion
D. Monoxide ion

Answer 1

Hint:According to the question, we should first know about the compounds or ions made by the oxygen, we have to check whether which ion is made by the single oxygen-oxygen bond that has an oxidation state of -1 on their oxygen atoms.

Complete answer:The peroxide ion, $O_2^{2-}$ , consists of a single oxygen-oxygen covalent bond and an oxidation state of -1 on their oxygen atoms. This ion is a powerful hydrogen ion acceptor, that makes the peroxide of the alkali metals and alkaline earth metals strong bases.
When two oxygen atoms are linked together by a single covalent bond, the peroxide ion will be formed. Several organic and inorganic peroxides are useful in the form of bleaching agents, are initiators of polymerization reaction.
In inorganic peroxides, there is a presence of negatively charged peroxide ions ($O_2^{2-}$ ) which we are discussing in this question that may be as salts of the very weak acid hydrogen peroxides. So, peroxide ions have a single oxygen covalent bond and have an oxidation state of -1 on their oxygen atoms.

Hence, the correct option is (C),peroxide ion.

Note:Metals like alkali metals and non-metals like hydrogen can form peroxide compounds.
Alkali metals can also form superoxide as well, it is the single stuff on earth which can form superoxide.