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Question:

The correct order of stability of the superoxides is:

KO2>CsO2>RbO2

KO2>RbO2>CsO2

CsO2>RbO2>KO2

RbO2>CsO2>KO2

Solution:

The correct option is CsO2>RbO2>KO2
Stability of superoxides increases with increase in size and electropositivity of the metal.
The order is:
CsO2>RbO2>KO2
Hence, option C is correct.