Which one of the following is incorrect for ideal solution ?

(1) Hmix=0

(2) Umix=0

(3) P=Pobs-Pcalculated by Raoul's law = 0

(4) Gmix=0

Subtopic:  Introduction & Colligative properties |
 70%
From NCERT
NEET - 2016
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At 100°C 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) 100°C

(2) 102°C

(3) 103°C

(4) 101°C

Subtopic:  Relative Lowering of Vapour Pressure | Elevation of Boiling Point |
 51%
From NCERT
NEET - 2016
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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°C.

(Given, vapour pressure data at 25°C, benzene = 12.8 kPa, toluene = 3.85 kPa)

1. The vapour will contain a higher percentage of toluene

2. The vapour will contain equal amounts of benzene and toluene

3. Not enough information is given to make a prediction

4. The vapour will contain a higher percentage of benzene

Subtopic:  Relative Lowering of Vapour Pressure |
 54%
From NCERT
NEET - 2016
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Which one is not equal to zero for an ideal solution?

1. ΔHmix 

2. ΔSmix

3. ΔVmix

4. ΔP=PObserved-PRaoult

Subtopic:  Introduction & Colligative properties |
 80%
From NCERT
NEET - 2015
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Which one of the following elctrolytes has the same value of van't Hoff's factor(i) as

that of Al2(SO4)(if all are 100% ionised)? 

1. K2SO4

2. K3[Fe(CN)6]

3. Al(NO3)3

4. K4[Fe(CN)6]

Subtopic:  Introduction & Colligative properties | Van’t Hoff Factor |
 76%
From NCERT
NEET - 2015
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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

Subtopic:  Depression of Freezing Point |
 71%
From NCERT
NEET - 2014
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pA and pare the vapour pressure of pure liquid components, A and B, respectively of an

ideal binary solution.If x, represents the mole fraction of component A, the total pressure

of the solution will be.

1. pA + xA(pB-pA)

2. pA + xA(pA-pB)

3. pB + xA(pB-pA)

4. pB + xA(pA-pB)

Subtopic:  Dalton’s Law of Partial Pressure |
 57%
From NCERT
NEET - 2012
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The freezing point depression constant format is -1.86°C m-1. If 5.00g Na2SO4 dissolved

in 45.0 g H2O, the freezing point is changed by -3.82°C. Calculate the van't Hoff factor

for NaSO4

1. 2.63

2. 3.11

3. 0.381

4. 2.05

Subtopic:  Depression of Freezing Point |
 61%
From NCERT
NEET - 2011
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The van't Hoff factor, i for a compound which undergoes dissociation in one solvent and

association in other solvent is respectively.

1. less than one and less than one

2. greater than one and less than one

3. greater than one and greater than one

4. less than one and greater than one

Subtopic:  Van’t Hoff Factor |
 81%
From NCERT
NEET - 2011
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An aqueous solution is 1.00 molal in KI. Which change will cause the vapour pressure of

the solution to increase ?

1. Addition of NaCl

2. Addition of Na2SO4

3. Addition of 1.00 molal KI

4. Addition of water

Subtopic:  Relative Lowering of Vapour Pressure |
 55%
From NCERT
NEET - 2010
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