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JEE Main levelOne or more correct optionsDifficulty 2 of 3rx029

In which compounds is the oxidation number of oxygen equal to $- 1/2$ ? Select all correct options.

A $KO X_{2}$
B $Na X_{2} O X_{2}$
C $RbO X_{2}$
D $OF X_{2}$

Answer: A, C

KO X_{2}

and

RbO X_{2}

contain the superoxide ion

O X_{2} X^{-}

, so each O is

- 1/2

.

Na X_{2} O X_{2}

is a peroxide (

- 1

) and

OF X_{2}

gives

+ 2

.

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