Ionic mobility of which of the following alkali metal ions is lowest when an aqueous solution of their salts are put under an electric field?

(1) Na                       

(2) K

(3) Rb                       

(4) Li

Which one is not equal to zero for an ideal solution?
(1)ΔH_mix 
(2)ΔS_mix
(3)ΔV_mix
(4)ΔP=P_Observed-P_Raoult

Which one of the following electrolytes has the same value of van't Hoff's factor(i) as that of
Al₂(SO₄)₃ (if all are 100% ionised)? 
 

1. K₂SO₄

2. K₃[Fe(CN)₆]

3. Al(NO₃)₃

4. K₄[Fe(CN)₆]

Of the following 0.10 m  aqueous solutions, which one will exhibit the largest freezing point depression?

(a) KCl

(b) C₆H₁₂O₆

(c) Al₂(SO₄)₃

(d) K₂SO₄

The van't Hoff factor, i for a compound which undergoes dissociation in one solvent and association in other solvent is respectively.

(1) less than one and less than one

(2) greater than one and less than one

(3) greater than one and greater than one

(4) less than one and greater than one

 A solution containing 10 g per 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) 250 g mol^-1               

(2) 300 g mol^-1

(3) 350 g mol^-1               

(4) 200 g mol^-1

1.00 g of a non-electrolyte solute (molar mass 250g mol) was dissolved in 51.2 g of benzene. If the freezing point depression constant, K_f of benzene is 5.12 K kg mol^-1, the freezing point of benzene will be lowered by:
1. 0.4 K
2. 0.3 K
3. 0.5 K
4. 0.2 K

Consider equimolal aqueous solutions of NaHSO₄ and NaCl with AT_b and Ar_b as their respective boiling point elevations. The value of $\underset{x\to 0}{\lim }\frac{\Delta T_b}{\Delta T_b^{\text{'}}}$ will be :

(1) 1

(2) 1.5

(3) 3.5

(4) 3

15 g of methyl alcohol is dissolved in 35 g of water. The weight percentage of methyl alcohol in solution is

(1) 30%

(2) 50%

(3) 70%

(4) 75%

Sea water contains 5.8 × 10^–3 g of dissolved oxygen per kilogram. The concentration of oxygen in parts per million is:

1. 5.8 ppm

2. 58.5 ppm

3. 0.58 ppm

4. 0.05 ppm