Q= how the stability of peroxide and superoxide increases as the size of alkali metals increases?? plzzz explain

The size of the ions increases as we move down the group. Thus, larger the size of the cation, more is its ability to stabilize the anions of larger size (that is interaction between ions of same size is more). The peroxides and superoxides are anions of large size. Therefore, they can be easily stabilized by larger size such as K, Rb​+, Cs​+etc. 

Hence, for group I cations, as we proceed down the group, the stability of peroxides and superoxides increases.

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The increasing stability of the peroxide or superoxide, as the size of metal ion increases is due to the stabilisation of large anions by larger cations through latttice energy effects.
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