1 molal aqueous solution of an electrolyte A₂B₃ is 60% ionised. The boiling point of the solution at 1 atm is-. (Rounded-off to the nearest integer)
[Given K_b for (H₂O) = 0.52 K kg mol^–1]

If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is:
(Rounded-off to the nearest integer) [K_b = 0.52K kg mol^–1]
1. 3
2. 5
3. 7
4. 2

When 12.2 g of benzoic acid is dissolved in 100 g of water, the freezing point of the solution was found to be
–0.93 °C. The number (n) of benzoic acid molecules associated (assuming 100% association) is:
(K_f(H₂O) = 1.86K kg mol^–1)

The mole fraction of glucose (C₆H₁₂O₆) in an aqueous binary solution is 0.1. The mass percentage of water in it to the nearest integer is:

When 9.45 g of ClCH₂COOH is added to 500 mL of water, its freezing point drops by 0.5 ºC.
The dissociation constant of ClCH₂ COOH is x × 10^–3. The value of x is:

(Rounded off to the nearest integer)

$[{\mathrm{K}}_{\mathrm{f}\left({\mathrm{H}}_2\mathrm{O}\right)}=\mathrm{1.86 }{\mathrm{kgmol}}^{-1}]$

1. 36 × 10^-3 
2. 29 × 10^-3 
3. 45 × 10^-3 
4. 30 × 10^-3 

4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x × 10^–1 . The value of x is ________. (Rounded off to the nearest integer)

1. 5

2. 4

3. 2

4. 1

If 250 cm³ of an aqueous solution containing 0.73 g of a protein A is isotonic with one litre of another aqueous solution containing 1.66 g of a protein B at 298 K, the ratio of the molecular masses of A and B is:

1. 1.54

2. 1.77

3. 1.65

4. 1.60

At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. The vapour pressure in mm Hg of n-heptane in its pure state is:
1. 500
2. 600
3. 700
4. 800