Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y . respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4 . The ratio of molar masses of X and Y is

Step-by-step solution

We know that for an non-electrolyte ∆ T f   =   K f m     where   m   =   molality ΔT fx ΔT fy = k f · m x k f · m y = 1 M x 1 M y ⇒ 1 4 = M y M x ⇒ M x : M y = 1 : 0 . 25