The oxide that gives `H_(2)O_(2)` on treatment with a dilute acid is

Answer

B

Explanation

Only true peroxides which have `O-O-bond` give hydrogen perxide with dilute acids.
`Na_(2) O_(2) + H_(2) SO_(4) rarr Na_(2) SO_(4) + H_(2) O_(2)`
Note :
(i) But peroxide with conc. Acids leberates `H_(2) O_(2)` and `O_(2)`, e.g.
`BaO_(2) + H_(2) SO_(4) (dil.) rarr BaSO_(4) + H_(2) O_(2)`
`BaO_(2) + 2H_(2) SO_(4) (conc.) rarrr 2 BaSO_(4) + 2 H_(2) O_(2) + O_(2)`
(ii) Superoxides (e.g., `KO_(2), RbO_(2), CsO_(2))` react with water to give `H_(2) O_(2)` and `O_(2)`.
`2 KO_(2) + 2H_(2) O rarr 2 KOH + H_(2) O_(2) + O_(2)`.