(C) The Assertion is correct because $K$,$Rb$,and $Cs$ are large alkali metals that can stabilize the superoxide ion $(O_2^-)$ in their superoxides ($

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If the Assertion is correct but Reason is incorrect.

(C) The Assertion is correct because $K$,$Rb$,and $Cs$ are large alkali metals that can stabilize the superoxide ion $(O_2^-)$ in their superoxides ($KO_2$,$RbO_2$,$CsO_2$).The Reason is incorrect because the ionic radii of alkali metals increase down the group as the number of shells increases. Therefore,the correct trend is $K^{+} < Rb^{+} < Cs^{+}$.

Class 11 Chemistry s-Block Elements Alkali metals

Difficult

Assertion : $K$,$Rb$ and $Cs$ (all belonging to group $1$) can also form superoxides.
Reason : The ionic radii of $K$,$Rb$ and $Cs$ show the following trend $Cs^{+} < Rb^{+} < K^{+}$.

AIIMS 2014 All AIIMS

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
C
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.