The species that do not contain peroxide ions is :

P b O_{2}

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H_{2} O_{2}

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S r O_{2}

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B a O_{2}

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Solution

The correct option is A $P b O_{2}$
Only true peroxides which have -O-O- bond give hydrogen peroxide with dilute acids.
$P b O_{2}$ does not give hydrogen peroxide with dilute acids. So it is not a true peroxide.
Hence option A is correct.

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