Which one of the following elctrolytes 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?

1. KCl

2. C₆H₁₂O₆

3. Al₂(SO₄)₃

4. K₂SO₄

6.02 x 10²⁰ molecules of urea are present in 100 mL of its solution. The concentration of the solution is: 

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 $∆$T_b and $∆T\text{'}$_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%

The seawater sample contains 5.8 × 10^–3 g of dissolved oxygen per kilogram of the sample. 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

Amount of NaOH present in 200 ml of 0.5 N solution is 

(1) 40 g

(2) 4 g

(3) 0.4 g

(4) 4.4 g