The mole(s) of K₂SO₄ to be dissolved in 12 moles of water to lower its vapor pressure by 10 mm of Hg at a temperature at which vapor pressure of pure water is 50 mm of Hg is :

1.	3 mol	2.	0.5 mol
3.	1 mol	4.	2 mol

The salt that possesses the highest freezing point

1. 0.01 M NaCl

2. 0.05 M Urea

3. 0.01 M MgCl₂

4. 0.02 M NaCl

Aluminium phosphate is 100 % ionized in 0.01 m aqueous solution. Hence, $∆{\mathrm{T}}_{\mathrm{b}}/{\mathrm{k}}_{\mathrm{b}}$ is-

Which solution has highest freezing point?

1. 1% glucose solution

2. 1% urea solution

3. 1% sucrose solution

4. All have same freezing

Osmotic pressure of 40% (w/V) urea solution is 1.64 atm. and that of 3.42% (w/V) cane sugar solution is 2.46 atm. When equal volumes of the above two solutions are mixed, the osmotic pressure of the resulting solution will be?  
 

(1) 1.64 atm

(2) 2.46 atm

(3) 4.10 atm

(4) 2.05 atm 
 

20g of naphthoic acid (C₁₁H₈O₂) dissolved in 50g of benzene (K_f=1.72 K Kg mol^-1) shows a depression in freezing point of 2K. The Vant Hoff factor is?

1. 0.5

2. 0.1

3. 2

4. 3

A 0.002 molar solution of NaCl having degree of dissociation of 90% at 27⁰C, has osmotic pressure equal to:-

1. 0.94 bar

2. 9.4 bar

3. 0.094 bar

4. 9.4 x 10^-4 bar

Determining the normality of a solution with a density of 0.6 g/ml and composed of 35% NH₄OH by mass.

1. 4.8 N

2. 10 N

3. 0.5 N

4. 6 N

The relative lowering of vapour caused by dissolving 71.3 g of a substance in 1000 g of water is 7.13 x 10^-3. The molecular mass of the substance is-

1. 180 g mol^-1

2. 18 g mol^-1

3. 1.8 g mol^-1

4. 360 g mol^-1

Total vapour pressure of a mixture of 1 mol A (p_A°  = 150 torr) and 2 mol B (${\mathrm{p}}_{\mathrm{B}}^{°}$ = 240 torr) is 200 torr. In this case:-

1. There is a positive deviation from Raoult's law
2. There is a negative deviation from Raoult's law
3. There is no deviation from Raoult's law
4. None of these