Among the s-block elements, the superoxide ion () is stable only in the presence of large cations. Which of the following factors primarily accounts for this stability?

Question

Among the s-block elements, the superoxide ion ($O_2^-$) is stable only in the presence of large cations. Which of the following factors primarily accounts for this stability?

Prashant Kotian · Accepted Answer

Correct answer: D. The superoxide ion is a large anion. According to lattice energy considerations, a large cation (like , , ) can effectively pack with and stabilize a large anion, leading to a high lattice energy that drives the formation of the superoxide.

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