3.24 g of Hg(NO₃)₂ (molar mass = 324) dissolved in 1000 g of water constitutes a solution having a freezing point of –0.0558°C while 21.68 g of HgCl₂ (molar mass = 271) in 2000 g of water constitutes a solution with a freezing point of –0.0744°C. The K_f for water is 1.86 $\frac{\text{K\hspace{0.17em}– Kg}}{\text{Mol}}$. About the state of ionization of these two solids in water it can be inferred that:

(1) Hg(NO₃)₂ and HgCl₂ both are completely ionized

(2) Hg(NO₃)₂ is fully ionized but HgCl₂ is fully unionized

(3) Hg(NO₃)₂ and HgCl₂ both are completely unionized

(4) Hg(NO₃)₂ is fully unionized but HgCl₂ is fully ionized  

A 500 gm toothpaste sample has 0.2 g fluoride concentration. The concentration of fluoride ions in terms of ppm level is

(1) 250 ppm

(2) 200 ppm

(3) 400 ppm

(4) 1000 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

10.6 g of Na₂CO₃ was exactly neutralised by 100 ml of H₂SO₄ solution. Its normality is

(1) 1 N

(2) 2 N

(3) 1.5 N

(4) 0.5 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

If 20 ml of 0.4 N NaOH solution completely neutralises 40 ml of dibasic acid. The molarity of acid solution is

(1) 0.1 M

(2) 0.2 M

(2) 0.3 M

(4) 0.4 M

H₂SO₄ solution whose specific gravity is 1.98 g ml^–1 and H₂SO₄ by volume is 95% (w/v). The molality of the solution will be

(1) 7.412

(2) 8.412

(3) 9.412

(4) 10.412

A solution contains 16 gm of methanol and 90 gm of water, mole fraction of methanol is

(1) 0.90

(2) 0.090

(3) 0.1

(4) 1.9

Lowering in vapour pressure is the highest for:

1. 0.2 m urea

2. 0.1 m glucose

3. 0.1 m MgSO₄

4. 0.1 m BaCl₂

The Vapour pressure of CCl₄ at 25°C is 143 mm Hg. 0.5 g of a non-volatile solute (mol. wt. 65) is dissolved in 100 ml of CCl₄. The vapor pressure of the solution is-

(Density of CCl₄ = 1 .58 g/cm³$)$ 

1. 141.93 mm Hg

2. 94.39 mm Hg

3. 199.34 mm Hg

4. 143.99 mm Hg