A solute x when dissolved in solvent associates to form a pentamer. The value of van't hoff factor (i) for the solute will be:-

(1) 0.5

(2)  5

(3) 0.2

(4) 0.1

Concept Questions :-

Van’t Hoff Factor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

What amount of CaCl2(i=2.47) is dissolved in 2L water so that its osmotic pressure is 0.5 atm at 27$°\mathrm{C}$:-

(1) 13.42 g

(2) 19.24 g

(3) 8.834 g

(4) 1.820 g

Concept Questions :-

Osmosis and Osmotic Pressure
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

One litre aqueous solution of sucrose (molar mass = 342 g/mol) weighing 1015 g is found to record an osmotic pressure of 4.8 atm at 293K. What is the molarity of the sucrose solution ? (R= 0.0821 L atm K-1 mol-1) :

(1) 0.84

(2) 0.21

(3) 0.42

(4) 0.63

Concept Questions :-

Osmosis and Osmotic Pressure
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The total vapour of a solution of liquid A and liquid b is 600 torr. The mole fraction of component A in liquid phase is 0.7. The vapour pressure of pure A and B are respectively

(1) 300 torr, 130 torr

(2) 1300 torr, 130 torr

(3) 300 torr, 1300 torr

(4) 300 torr, 300 torr

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The vapour pressure of water at room temperature is 30 mm of Hg. If the mole fraction of the water is 0.9, the vapour pressure of solution will be

(1) 30 mm of Hg

(2) 24 mm of HG

(3) 21 mm of Hg

(4) 27 mm of Hg

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The Van't Haff factor of a 0.005 M aqueous solution of KCl is 1.95. The degree of ionisation of KCl is:

(1) 0.95

(2) 0.97

(3) 0.94

(4) 0.96

Concept Questions :-

Van’t Hoff Factor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

The solution having highest vapour pressure is (Assume 100% ionisation of electrolytes)

(1) 1 N KNO3

(2) 1 N Ba(NO3)2

(3) 1 N Al2(SO4)3

(4) 1 N Th(NO3)4

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Difficulty Level:

K4[Fe(CN)6] is 60% ionised. Then the value of Van't Hoff factor is

1. 1.6

2. 2.4

3. 3

4. 3.4

Concept Questions :-

Van’t Hoff Factor
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

Compound PdCl4.6H2O is a hydrated complex, 1 molal aqueous solution of it has freezing point 269.28K. Assuming 100% ionization of complex, calculate the molecular formula of the complex

(Kt for water = 1.86 K kg mole-1)

1. [Pd(H2O)6]Cl4

2. [Pd(H2O)4Cl2]Cl2.2H2O

3. [Pd(H2O)3Cl3]Cl.3H2O

4. [Pd(H2O)Cl4]4H2O

Concept Questions :-

Depression of Freezing Point
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

How much oxygen is dissolved in 100ml water at 298K if partial pressure of oxygen is 0.5 atm and KH=1.4 X 10-3 M/atm ?

1. 22.4 mg

2. 22.4 g

3. 2.24 g

4. 2.24 mg

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law