Question:
The pair of elements which do NOT form superoxides in excess oxygen is:
The pair of elements which do NOT form superoxides in excess oxygen is:
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Smaller cations stabilize oxide more than superoxide.
Updated On: Jun 17, 2026
- K, Rb
- Na, K
- Li, Mg
- K, Ba
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The Correct Option is C
Solution and Explanation
Step 1: Superoxide formation is favored by large alkali metals (K, Rb, Cs).
Step 2: Lithium forms only oxide (Li$_2$O) due to small size and high lattice energy.
Step 3: Magnesium (alkaline earth metal) forms oxide (MgO), not superoxide.
Step 4: Hence Li and Mg both do NOT form superoxides.
Step 5: Therefore correct pair is Li, Mg.
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