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JEE Main levelSingle correct optionDifficulty 2 of 3bn023

Which one of the following is a true peroxide, i.e. contains the ion $O X_{2} X^{2 -}$ with O at $- 1$ ? (In the other three the metal is in its $+ 4$ state and the oxide ion is $O X^{2 -}$ .)

A $BaO X_{2}$
B $SnO X_{2}$
C $MnO X_{2}$
D $PbO X_{2}$

Answer: A

BaO X_{2}

has

Ba X^{2 +}

and

O X_{2} X^{2 -}

(O =

- 1

). In

MnO X_{2}

,

PbO X_{2}

and

SnO X_{2}

the metal is

+ 4

with O at

- 2

, so these are dioxides, not peroxides.

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