NEET 2015 Chemistry question

The boiling point of 0.2 mol kg solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is **true** in this case ?

(1)Molecular mass of X is greater than the molecular mass of Y.
(2)Molecular mass of X is less than the molecular mass of Y.
(3)Y is undergoing dissociation in water while X undergoes no change.
(4)X is undergoing dissociation is water.Correct

Answer: (4)

Solution

Elevation of boiling point is a colligative property: . Both solutions are in water (same ) and have the same molality, so implies . A larger van't Hoff factor means that X gives more

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Question ID VK-091688