Statement - I : The lattice energy of superoxide of alkali metals increases with an increase in the size of the metal ion
Statement - II : Lattice energy is directly proportional to size of the metal ion

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Both statement - I and II are incorrect

Statement I and II are correct and II explains I

Statement I and II are correct and II does not explain I

Statement - I is correct and Statement - II is incorrect

answer is C.

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Detailed Solution

Superoxide formula of alkali metal MO₂
Question Image
As the size of metal ↑es the stability of superoxide ion (O₂^-) by the M+ ion ↑es and hence stability of super Oxide ↑es and hence lattice energy ↑es
stability Order: LiO₂ < NaO₂< KO₂ < RbO₂ < CsO₂
Hint: A large size cation will stabiles the large size anion(O₂^-)
In general
$\large L.E\propto\;\frac{1}{size\;of\;metal\;ion}$
Statement - I is correct & statement - II is in correct.