Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: K, Rb and Cs form superoxides. Reason: The stability of the superoxides increases from K to Cs due to decrease in lattice energy.A) If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:.
B) If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:.
C) If Assertion: is true but Reason: is false.
D) If both Assertion: and Reason: are false.
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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