First slide

Alkali metals

Question

The correct order of stability for the following superoxides is

Moderate

A

${KO}_{2} > {RbO}_{2} > {CsO}_{2}$
B

${RbO}_{2} > {CsO}_{2} > {KO}_{2}$
C

${CsO}_{2} > {RbO}_{2} > {KO}_{2}$
D

${KO}_{2} > {CsO}_{2} > {RbO}_{2}$

Solution

With the increase in size of metal ion $K^{\oplus} < {Rb}^{\oplus} < {Cs}^{\oplus},$ compatibility with superoxide ion ( $O_{2}^{-}$ ), increases, resulting in increase in lattice energy or stability of the
peroxide formed.

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