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Question

The oxidation state of Oxygen in KO2 is


A

-2

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B

+2

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C

+1/2

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D

-1/2

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Solution

The correct option is D

-1/2


We know that the sum of oxidation numbers of all the elements in a compound is equal to 0.
Here the oxidation number of K (Potassium) is +1. So, let the oxidation number of O (oxygen) be x.
If the sum of oxidation numbers of this compound is equal to 0. We get the equation as
+1+2×x=0
2×x=1
Hence the oxidation number of O (oxygen) is -1/2 or -0.5


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