JEE Main · 2023 · 25 Jan 2023 · Shift 1 · Hydrogen

Volume strength states the volume of oxygen, at standard conditions, that one volume of the solution releases on decomposition, and it is related to concentration by volume strength $=11.2\times$ molarity, since one mole of hydrogen peroxide yields $11.2$ L of oxygen. A $25$-volume solution thus has molarity $25/11.2\approx 2.23$ mol L${}^{-1}$, and multiplying by the molar mass $34$ g mol${}^{-1}$ gives about $75$ g per litre. One litre of the marketed solution contains roughly $75$ g of hydrogen peroxide.