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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn066

Select all compounds in which oxygen does not have oxidation number $- 2$ (treat $Na X_{2} O X_{2}$ as containing $O X_{2} X^{2 -}$ , $KO X_{2}$ as containing $O X_{2} X^{-}$ , and F as $- 1$ ).

A $Na X_{2} O X_{2}$
B $Fe X_{3} O X_{4}$
C $OF X_{2}$
D $KO X_{2}$

Answer: A, C, D

Na X_{2} O X_{2}

: O

- 1

.

OF X_{2}

: O

+ 2

.

KO X_{2}

: O

- 1/2

.

Fe X_{3} O X_{4}

is a mixed oxide of Fe(II) and Fe(III) with ordinary

O X^{2 -}

, so O is

- 2

.

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