Hydrogen peroxide can be prepared in the laboratory by the action of dilute acids on metallic peroxide. In one method, sodium peroxide is added in samall amount at a time to a dilute solution of sulphuric acid in cold. Sodium peroxide can be replaced by barium peroxide. In this case, a paste of BaO_(2).8H_(2)O is prepared and added gradually to an ice-cold dilute sulphuric acid. Barium sulphate precipitates out leaving behind a dilute solution of hydrogen peroxide. Phosphoric acid can also be used in place of sulphuric acid. The oxide that gives hydrogen peroxide on treatment with a dilute acid is:

Hydrogen peroxide can be prepared in the laboratory by the action of d

1.	Hydrogen peroxide can be prepared in the laboratory by the action of dilute acids on metallic peroxide. In one method, sodium peroxide is added in samall amount at a time to a dilute solution of sulphuric acid in cold. Sodium peroxide can be replaced by barium peroxide. In this case, a paste of BaO_(2).8H_(2)O is prepared and added gradually to an ice-cold dilute sulphuric acid. Barium sulphate precipitates out leaving behind a dilute solution of hydrogen peroxide. Phosphoric acid can also be used in place of sulphuric acid. The oxide that gives hydrogen peroxide on treatment with a dilute acid is:
Answer» `PbO_(2)` `SrO_(2)` `MnO_(2)` `TiO_(2)` Solution :`PbO_(2), MnO_(2), TiO_(2)`areoxide but`SrO_(2)` is a stonsium PEROXIDE .