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

EAMCETEAMCET 2003

Solution:

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. $