Question

$K, Rb$ and $Cs$ form superoxides. The stability of the superoxides increases from '$K$' to '$Cs$' due to decrease in lattice energy. The correct answer is

• 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

Answer 1

Answer: (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Answer 2

$K , Rb, Cs$ from superoxides when they are burned in the air .as we move down the group, the size of an atom from $k$ to $Cs$ increases so, lattice energy decreases and hence the stability of superoxide also decreases.