A solution contains 16 gm of methanol and 90 gm of water, mole fraction of methanol is [BHU 1981, 87; EAMCET 2003]

(1) 0.90

(2) 0.090

(3) 0.1

(4) 1.9

Concept Questions :-

Concentration Term and Numericals
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Difficulty Level:

A solution has 25% of water, 25% ethanol and 50% acetic acid by mass. The mole fraction of each component will be [EAMCET 1993]

(1) 0.50, 0.3, 0.19

(2) 0.19, 0.3, 0.50

(3) 0.3, 0.19, 0.5

(4) 0.50, 0.19, 0.3

Concept Questions :-

Concentration Term and Numericals
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Difficulty Level:

34.2 g of cane sugar is dissolved in 180 g of water. The relative lowering of vapour pressure will be

(1) 0.0099

(2) 1.1597

(3) 0.840

(4) 0.9901

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Difficulty Level:

Lowering in vapour pressure is the highest for [Roorkee 1989; BHU 1997]

(1) 0.2m urea

(2) 0.1 m glucose

(3) 0.1m MgSO4

(4) 0.1m BaCl2

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Difficulty Level:

Vapour pressure of CCl4 at 25°C is 143 mm Hg 0.5 g of a non-volatile solute (mol. wt. 65) is dissolved in 100 ml of CCl4. Find the vapour pressure of the solution. (Density of $CC{l}_{4}=1.58\text{\hspace{0.17em}}g/c{m}^{3}\right)$ [CBSE PMT 1996]

(1) 141.93 mm

(2) 94.39 mm

(3) 199.34 mm

(4) 143.99 mm

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Difficulty Level:

The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour pressure in contact with equimolar solution of benzene and toluene is [Pb. CET 1988]

(1) 0.50

(2) 0.6

(3) 0.27

(4) 0.73

Concept Questions :-

Concentration Term and Numericals
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Difficulty Level:

The vapour pressure of a solvent decreases by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be if the decrease in vapour pressure is to be 20 mm of mercury then the mole fraction of the solvent is [CBSE PMT 1998]

(1) 0.8

(2) 0.6

(3) 0.4

(4) None

Concept Questions :-

Concentration Term and Numericals
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Difficulty Level:

The vapour pressure of a solvent A is 0.80 atm. When a non-volatile substance B is added to this solvent its vapour pressure drops to 0.6 atm. the mole fraction of B in the solution is [MP PMT 2000]

(1) 0.25

(2) 0.50

(3) 0.75

(4) 0.90

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Osmotic pressure is 0.0821 atm at a temperature of 300 K. find concentration in mole/litre [Roorkee 1990]

(1) 0.033

(2) 0.066

(3) 0.33 × 10–2

(4) 3

Concept Questions :-

Osmosis and Osmotic Pressure
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Difficulty Level:

The osmotic pressure of 5% (mass-volume) solution of cane sugar at 150°C (mol. mass of sugar = 342) is [BHU 1995]

(1) 4 atm

(2) 5.07 atm

(3) 3.55 atm

(4) 2.45 atm

Concept Questions :-

Osmosis and Osmotic Pressure