Q.

Which one of the following super oxide is most stable

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a

RbO2

b

KO2

c

CsO2

d

NaO2

answer is C.

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Detailed Solution

MO2(super oxides) are paramagnetic with one unpaired electron in pi anti bonding molecular orbital;MO2(super oxides) are yellow (or) orange in colour Lithium forms monoxidesSodium with limited oxygen forms monoxide and with excess oxygen forms peroxide;K, Rb and Cs form super oxides. Stability of super oxides increases with increase in cation size. This fact is explained by Lattice enthalpy effects.
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Which one of the following super oxide is most stable