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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3bn199

Convention: O is $- 1$ in a peroxide ion, $- 1/2$ in a superoxide ion, and F is $- 1$ . Select ALL compounds in which oxygen has oxidation number $- 1$ .

A $BaO X_{2}$
B $KO X_{2}$
C $Rb X_{2} O X_{2}$
D $OF X_{2}$

Answer: A, C

BaO X_{2}

and

Rb X_{2} O X_{2}

are peroxides (ion

O X_{2} X^{2 -}

), O =

- 1

.

KO X_{2}

is a superoxide:

- 1/2

. In

OF X_{2}

, O =

+ 2

.

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