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JEE Main levelSingle correct optionDifficulty 2 of 3bn177

Assertion (A): The oxidation number of oxygen in $KO X_{2}$ is $- 1$ . Reason (R): $KO X_{2}$ contains the superoxide ion $O X_{2} X^{-}$ . Choose the correct option.

ABoth A and R are true and R is the correct explanation of A
BBoth A and R are true but R is not the correct explanation of A
CA is true but R is false
DA is false but R is true

Answer: D

KO X_{2}

does contain superoxide

O X_{2} X^{-}

(R true). The ion has charge

- 1

shared by two O atoms, so each O is

- 1/2

, not

- 1

(A false).

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