Question

30 lit of oxygen is liberated at STP by the complete decomposition of sample of 1 lit of H2O2 solution is nearly

Answer 1

The "volume" rating system for hydrogen peroxide expressed the concentration in terms of the volume of oxygen produced on decomposition so 1 ml of 10 volume peroxide would produce 10 ml of oxygen when completely decomposed. Therefore 1 Lit of 30 vol peroxide will produce 30 Lit of oxygen.