The boiling point of 0.2 mol 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? [2015]

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Q.
The boiling point of 0.2 mol ${kg}^{- 1}$ 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 [2015]

1 Molecular mass of X is less than the molecular mass of Y.

2 Y is undergoing dissociation in water while X undergoes no change.

3 X is undergoing dissociation in water.

4 Molecular mass of X is greater than the molecular mass of Y.

Ans.
(3)

$Δ T_{b} = i K_{b} m$

For equimolal solutions, elevation in boiling point will be higher if solution undergoes dissociation, i.e., $i > 1$ .

Solution

Q.
The boiling point of 0.2 mol ${kg}^{- 1}$ 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 [2015]

1 Molecular mass of X is less than the molecular mass of Y.

2 Y is undergoing dissociation in water while X undergoes no change.

3 X is undergoing dissociation in water.

4 Molecular mass of X is greater than the molecular mass of Y.

Ans.
(3)

$Δ T_{b} = i K_{b} m$

For equimolal solutions, elevation in boiling point will be higher if solution undergoes dissociation, i.e., $i > 1$ .

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Solution

Q. The boiling point of 0.2 mol kg-1 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 [2015]

1 Molecular mass of X is less than the molecular mass of Y.

2 Y is undergoing dissociation in water while X undergoes no change.

3 X is undergoing dissociation in water.

4 Molecular mass of X is greater than the molecular mass of Y.

Ans. (3) ΔTb=iKbm For equimolal solutions, elevation in boiling point will be higher if solution undergoes dissociation, i.e., i>1.

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Q.
The boiling point of 0.2 mol ${kg}^{- 1}$ 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 [2015]

Ans.
(3)

$Δ T_{b} = i K_{b} m$

For equimolal solutions, elevation in boiling point will be higher if solution undergoes dissociation, i.e., $i > 1$ .