When CO2 is bubbled through a solution of barium peroxide in water (AFMC 2005)

This is Merck’s process of preparing hydrogen peroxide. When 2 CO is passed through aqueous solution of 2 3 BaO ,BaCO is precipitated and 2 2 H O is formed. 2 2 2 3 2 2 BaO CO H O BaCO H O -> 2 2 H O can also be prepared by reaction of 2 4 H SO with hydrated barium peroxide 2 2 2 4 4 2 2 2 BaO .8H O H SO BaSO 8H O H O ->