The vapour pressure of water depends upon:

(1) surface area of container

(2) volume of container

(3) Temperature

(4) All of these

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows

(1) No deviation from Raoult's law

(2) Positive deviation from Raoult's law

(3) Negative deviation from Raoult's law

(4) That the solution is unsaturated

Concept Questions :-

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A 5.85% solution of Nacl has vapour pressure close to

1. 5.85% solution of urea

2. 2m solution of glucose

3. 1m solution of urea

4. 5.8% solution of glucose

Concept Questions :-

Osmosis and Osmotic Pressure
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Mole of K2SO4 to be dissolved in 12 moles water to lower its vapour pressure by 10 mm of Hg at a temperature at which vapour pressure of pure water is 50 mm of Hg is

1. 3 mol

2. 0.5 mol

3. 1 mol

4. 2 mol

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Which has highest freezing point ?

1. 0.01M NaCl

2. 0.05M Urea

3. 0.01 M MgCl2

4. 0.02 M NaCl

Concept Questions :-

Depression of Freezing Point
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Aluminium phosphate is 100% ionized in 0.01m aqueous solution. Hence, Tb/kb is

1. 0.01

2. 0.015

3. 0.0175

4. 0.02

Concept Questions :-

Elevation of Boiling Point
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Which solution has highest freezing point?

1. 1% glucose solution

2. 1% urea solution

3. 1% sucrose solution

4. All have same freezing

Concept Questions :-

Depression of Freezing Point
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Osmotic pressure of 40% (w/V) urea solution is 1.64 atm. and that of 3.42% (w/V) cane sugar solution is 2.46 atm. When equal volumes of the above two solutions are mixed, the osmotic pressure of the resulting solution will be?  

(1) 1.64 atm

(2) 2.46 atm

(3) 4.10 atm

(4) 2.05 atm 

Concept Questions :-

Osmosis and Osmotic Pressure
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20g of naphthoic acid (C11H8O2) dissolved in 50g of benzene (Kf=1.72 K Kg mol-1) shows a depression in freezing point of 2K. The Vant Hoff factor is?

(1) 0.5

(2) 0.1

(3) 2

(4) 3

Concept Questions :-

Van’t Hoff Factor
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A 0.0002 molar solution of NaCl having degree of dissociation of 90% at 270C, has osmotic pressure equal to:-

1. 0.94 bar

2. 9.4 bar

3. 0.094 bar

4. 9.4 x 10-4 bar

Concept Questions :-

Osmosis and Osmotic Pressure
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Difficulty Level: