Question
Chemistry Question on Colligative Properties
Two solutions A and B are prepared by dissolving 1g of non-volatile solutes X and Y respectively in 1kg 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 :
A
1:4
B
1:0.25
C
1:0.20
D
1:5
Answer
1:0.25
Explanation
Solution
ΔTfyΔTfx=kf⋅mykf⋅mx=11/My11/Mx
⇒41=MxMy
⇒Mx:My=1:0.25
Hence, the correct option (B):1:0.25