In the reaction $M + O_{2} \to M O_{2}$ (superoxide),the metal is :

L i

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N a

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K

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B a

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Solution

The correct option is D $K$
Potassium reacts with oxygen to form potassium super oxide. With lithium, it forms lithium oxide. With sodium, it forms peroxide and oxide of sodium. With barium, it forms barium oxide.

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