Chemistry - Complete s-block Question with Solution | TestHub

The species having an $\mathrm{O}-\mathrm{O}$ bond and $\mathrm{O}$ in an oxidation state of $-\frac{1}{2}$ are super oxides and is represented as ${\mathrm{O}}_2^{-}$. Usually these are formed by active metals such as ${\mathrm{KO}}_2$, ${\mathrm{RbO}}_2$ and ${\mathrm{CsO}}_2.$ For the sal ts of larger anions (like ${\mathrm{O}}_2^{-}$), lattice energy increases in a group. Since, lattice energy is the driving force for the formation of an ionic compound and its stability, the stability o the superoxides from 'K' to 'Cs' als increases.