Answer:
\[{{K}^{+}},\,R{{b}^{+}}\] and \[C{{s}^{+}}\]
are large cations and superoxide ion \[(O_{2}^{-})\] is larger than oxide \[({{O}^{2-}})\]
and peroxide \[(O_{2}^{2-})\]ions. Since a large cation stabilizes a large anion,
therefore, these metals form super oxides in preference to oxides and
peroxides.
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