Assertain (A): K, Rb and Cs form superoxides.
Reason (R) : The stability of the superoxides increases from 'K' to 'Cs' due to decrease in lattice energy.
The correct answer is

Options

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) in true

Answer

(c )

Explanation

Group 1 elements like K, Rb and Cs form super oxides `KO_(2), RbO_(2), and CsO_(2)` respectively.
The stability of super oxides from K to Cs increases due to increase in the lattice energy of the compounds