Question

The elements of s-block group 1A that produce superoxides have

• A. High electronegativity
• B. High ionization energy
• C. High polarizability
• D. Low ionization potential

Answer 1

The correct option is D

Low ionization potential

A simple recall of potassium superoxide's properties can help answer this question. Of the given options the first three are not applicable . These elements are highly electropositive, that is they tend to lose the valence shell electron easily. The only major exception here is Lithium which has a high ionization enthalpy (first). But Lithium does not easily form superoxide. ${O_2}^{-}$ is a large anion. The superoxides of K, Rb and Cs are stable as these cations can stabilize the large ${O_2}^{-}$ anion. So option d) Low ionization potential