Two solutions A and B are prepared by dissolving 1   g of non-volatile solutes X and Y . respectively…

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
  1. 1:4
  2. 1:0.25
  3. 1:0.20
  4. 1:5

Solution

We know that for an non-electrolyte

∆Tf = Kfm  where m = molality

ΔTfxΔTfy=kf·mxkf·my=1Mx1My

⇒14=MyMx

⇒Mx:My=1:0.25

Asked in: JEE Main 2022 (25 Jul Shift 2)

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