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In the reaction, M+O(2)to MO(2) (superox...

In the reaction, `M+O_(2)to MO_(2)` (superoxide), the metal M is

A

lithium

B

sodium

C

potassium

D

barium

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The correct Answer is:
C
As the size of metal ion increases, tendency to form superoxides increases. Since, superoxide is of ` M O _ 2 ` type , it is clear it is alkali metal superoxide. In superoxide, oxygen is in ` O _ 2^ - ` form. Hence, it is potassium superoxide ` (KO _ 2 ) ` .
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-PRACTICE SET 15-PAPER 1 (PHYSICS & CHEMISTRY )
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