A) Both [A] and [R] are true and [R] is the correct explanation of [A]
B) Both [A] and [R] are true but [R] is not the correct explanation of [A]
C) [A] is true but [R] is not true
D) [A] is not true but [R] is true
Correct Answer: C
Solution :
Superoxides are the species having an \[O-O\] bond and O in an oxidation state of \[-\frac{1}{2}\] (superoxide ion is \[O_{2}^{-}\]). Usually these are formed by active metals such as \[K{{O}_{2}},Rb{{O}_{2}}\] and \[Cs{{O}_{2}}\]. For the salts of larger anions (like \[O_{2}^{-}\]), lattice energy increases in a group. Since, lattice energy is the driving force for the formation of an ionic compound and its stability, the stability of the superoxides from K to Cs also increases.
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