A non-volatile solute is dissolved in water. If its degree of association is 50%. What will be its freezing point when the boiling point is 100.52$°\mathrm{C}$. [K_b=0.52 K kg mol^-1, K_f=1.86K kg mol^-1]

1. -0.52 K

2. -0.52$°\mathrm{C}$

3. -1.86$°\mathrm{C}$

4. 275.01 K

When 36 g of a solute having the emperical formula CH₂O is dissolved in 1.2 kg of water, the solution freezes at -0.93$°\mathrm{C}$. What is the molecular formula of solute (K_f=1.86 kg K mol^-1)

(1) C₂H₄O

(2) C₂H₂O₂

(3) C₂H₄O₃

(4) C₂H₄O₂

If partial pressure of oxygen is 0.5 atm and K_H = 1.4 × 10^-3 M/atm, then the amount of oxygen dissolved in 100 ml water at 298K is-

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

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

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 molality 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

The total vapor of a solution of liquid A and liquid B is 600 torr. The mole fraction of component A in the liquid phase is 0.7 and in the vapor phase is 0.35. The vapor 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

What is the vapour pressure of a solution when the mole fraction of water is 0.9, assuming the vapor pressure of pure water is 30 mm Hg at room temperature?

1. 30 mm of Hg

2. 24 mm of Hg

3. 21 mm of Hg

4. 27 mm of Hg

The van't Hoff 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

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