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

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

50 ml of $10N{H}_{2}S{O}_4,25ml$ of 12 N HCl and 40 ml of $5NHN{O}_3$ were mixed together and the volume of the mixture was made 1000 ml by adding water. The normality of the resulting solution will be 

(1) 1 N

(2) 2 N

(3) 3 N

(4) 4 N

Equal volumes of $0.1\mathrm{M}{\mathrm{AgNO}}_3$ and 0.2 M NaCl are mixed. The concentration of ${\mathrm{NO}}_3^{-}$ ions in the mixture will be 

(1) 0.1 M

(2) 0.05 M

(3) 0.2 M

(4) 0.15 M

Amount of oxalic acid $({\left(\mathrm{COOH}\right)}_2.2{\mathrm{H}}_2\mathrm{O})$ in grams that is required to obtain 250 ml of a semi-molar solution is -