Introduction Colligative Properties

A solution containing 10 g/dm³ of urea (molecular mass = 60 g mol^-1) is isotonic with a 5 % solution of a non-volatile solute. The molecular mass of this non-volatile solute is:

1.	25 g mol-1	2.	300 g mol-1
3.	350 g mol-1	4.	200 g mol-1

The correct option for the value of vapour pressure of a solution at 45 $°$C with benzene to octane in a molar ratio 3:2 is:

[At 45 $°$C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]

1.	336 mm of Hg	2.	350 mm of Hg
3.	160 mm of Hg	4.	168 mm of Hg

The plot of osmotic pressure vs concentration for a solution gives a straight line with slope 25.73 L bar mol^-1. The temperature at which osmotic pressure measurement is done is:

1.	310°C	2.	25.73°C
3.	12.05 °C	4.	37°C

Match List-I with List-II :

	List-I (Example)		List-II (Type of solution)
A.	Humidity	I.	Solid in solid
B.	Alloys	II.	Liquid in gas
C.	Amalgams	III.	Solid in gas
D.	Smoke	IV.	Liquid in solid

Choose the correct answer from the options given below:
1. A-III, B-I, C-IV, D-II
2. A-III, B-II, C-I, D-IV
3. A-II, B-IV, C-I, D-III
4. A-II, B-I, C-IV, D-III