Solutions

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at 25 . (Given, vapour pressure data at 25 , benzene = 12.8 kPa, toluene = 3.85 kPa)

1. The vapour will contain equal amounts of benzene and toluene.
2. Not enough information is given to make a prediction.
3. The vapour will contain a higher percentage of benzene.
4. The vapour will contain a higher percentage of toluene

At 100 the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be

1. 102
2. 103
3. 101
4. 100

The van't Hoff factor (i) for a dilute aqueous solution of the strong electrolyte barium hydroxide is

1. 0
2. 1
3. 2
4. 3

Which one of the following is incorrect for ideal solution?

1. Hmix = 0
2. Umix = 0
3. P = Pobs - Pcalculated by Raoult's law = 0
4. Gmix = 0

What is the mole fraction of the solute in a 1.00 m aqueous solution?

1. 1.770
2. 0.0354
3. 0.0177
4. 0.177

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?

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.

Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of Al2(SO4)3 (if all are 100% ionised)?

1. Al(NO3)3
2. K4[Fe(CN)6]
3. K2SO4
4. K3[Fe(CN)6]

Which of them is not equal to zero for an ideal solution?

1. Vmix
2. P = Pobserved - PRaoult
3. Hmix
4. Smix

Of the following 0.10 m aqueous solutions, which one will exhibit the largest freezing point depression?

1. KCl
2. C6H12O6
3. Al2(SO4)3
4. K2SO4

Which condition is not satisfied by an ideal solution?

1. mixV = 0
2. mixS = 0
3. Obeyance to Raoult's Law
4. mixH = 0