Superoxide of type $M O_{2}$ are formed by all except :

Potassium.

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Beryllium.

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Strontium.

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Barium.

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Solution

The correct option is B Beryllium.
Beryllium salts are much less thermally stable because the high lattice energy of the oxide lowers the Gibbs energy change for the decomposition reaction.

Beryllium do not form superoxide,as it is having less size.

Hence option B is correct.

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