The correct order of stability for the following superoxides is:

K O_{2} > R b O_{2} > C s O_{2}

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R b O_{2} > C s O_{2} > K O_{2}

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C s O_{2} > R b O_{2} > K O_{2}

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K O_{2} > C s O_{2} > R b O_{2}

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Solution

The correct option is C $C s O_{2} > R b O_{2} > K O_{2}$
Larger the size of the cation, more is the stability of the superoxide.

Due to lattice energy effect, larger anions are stabilised by larger cations.
Therefore. the correct stability order for superoxide is:
$C s O_{2} > R b O_{2} > K O_{2}$

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