A solution of acetone in ethanol:

1. Shows a negative deviation from Raoult's law.

2. Shows a positive deviation from Raoult's law.

3. Behaves like a near ideal solution.

4. Obeys Raoult's law.

Three solutions are prepared by adding 'w' gm of 'A' into 1kg of water, 'w' gm of 'B' into another 1 kg of water and 'w' gm of 'C' in another 1 kg of water (A, B, C are non electrolytic). Dry air is passed from these solutions in sequence (A → B → C). The loss in weight of solution A was found to be 2gm while solution B gained 0.5 gm and solution C lost 1 gm. Then the relation between molar masses of A, B and C is :

(1) MA: M_B : Mc = 4 : 3 : 5

(2) M_A : M_B: M_c = $\frac{1}{4}:\frac{1}{3}:\frac{1}{5}$

(3) Mc > MA > MB

(4) MB > M_A> M_c

How many mili moles of sucrose should be dissolved in 500 gms of water so as to get a solution which has a difference of 103.57°C between boiling point and freezing point.

(K₁ = 1.86 K Kg mol⁻¹, K_b = 0.52 K Kg mo1⁻¹)

(1) 500 mmoles

(2) 900 mmoles

(3) 750 mmoles

(4) 650 mmoles

The molar heat of vapourization of toluene is AHv. If its vapour pressure at 315 K is 60 torr & that at 356K is300 torr then AHv = ? (log 2 = 0.3)

(1) 37.5 kJ/mole

(2) 3.75 kJ/mole

(3) 37.5 J/mol

(4) 3.75 J/mole

Relative decrease in vapour pressure of an aqueous solution containing 2 moles [Cu(NH₃)₃Cl) Cl in 3 moles H₂O is 0.50. On reaction with AgNO₃, this solution will form (assuming no change in degree of ionisation of substance on adding AgNO₃)

(1) 1 mol AgCl

(2) 0.25 mol AgCl

(3) 0.5 mol AgCl

(4) 0.40 mol AgCl

Which of the following has been arranged in order of decreasing freezing point?

A solution of x moles of sucrose in 100 grams of water freezes at −0.2°C. As ice separated the freezing point goes down to 0.25°C. How many grams of ice would have separated?

(1) 10 grams

(2) 20 grams

(3) 25 grams

(4) 23 grams

An ideal mixture of liquids A and B with 2 moles of A and 2 moles of B has a total vapour pressure of 1 atm at a certain temperature. Another mixture with 1 mole of A and 3 moles of B has a vapour pressure greater than 1 atm. But if 4 moles of C are added to the second mixture, the vapour pressure comes down to 1 atm. Vapour pressure of C, P_c° = 0.8 atm. Calculate the vapour pressures of pure A and pure B.

(1) P_A° = 1.4 atm, P_B° = 0.7 atm

(2) P_A = 1.2 atm, P_B° = 0.6 atm

(3) P_A = 1.4 atm, P_B° = 0.6 atm

(4) P_A° = 0.6 atm, P_B° = 1.4 atm

A sample of air is saturated with benzene (vapor pressure = 100 mm Hg at 298 K) at 298K, 750mm Hgpressure. If it is isothermally compressed to one third of its initial volume, the final pressure of the system is

(1) 2250 torr

(2) 2150 torr

(3) 2050 torr

(4) 1950 torr

Available solutions are 1L of 0.1 M NaCl and 2L of 0.2 M CaCl₂. Using only these two solutions what maximum volume of a solution can be prepared having [Cl^–] = 0.34M exactly. Both electrolytes are strong

(1) 2.5 L

(2) 2.4 L

(3) 2.3 L

(4) None of these