The boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 400 g of water such that it boils at 100°C?

 ( K_b H₂O = 0.52 K kg mol⁻¹)

1. 97.33g

2. 121.67g

3. 145.14g

4. 124.79g

What is the mass of ascorbic acid (Vitamin C, C₆H₈O₆) to be dissolved in 75 g of acetic acid to lower its melting point by 1.5°C? K_f = 3.9 K kg mol⁻¹.

1. 6.83 g

2. 6.03 g

3. 4.12 g

4. 5.08 g

What is the osmotic pressure exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C?

1. 42.56 Pa

2. 30.98 Pa

3. 23.67 Pa

4. 67.55 Pa

Among the following  application/s of osmosis is/are : 

(1) In animals, water moves into different parts of the body.

(2) Stretching of leaves, flower.

Henry’s law constant for CO₂ in water is 1.67 × 10⁸ Pa at 298 K. What is the quantity of CO₂ in 500 mL of soda water when packed under 2.5 atm CO₂ pressure at 298 K?

1. 1.57 g

2. 1.85 g

3. 0.15 g

4. 1.96 g

H₂S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If the solubility of H₂S in water at STP is 0.195 molal, what is the Henry’s law constant?

1. 255 bar

2. 293 bar

3. 342 atm

4. 282 bar

What is the molarity of KI if density of 20% (mass/mass) aqueous KI is 1.202 g mL^-1?

1. 1.23 mol L^-1

2. 1.45 mol L^-1

3. 1.62 mol L^-1

4. 1.45 mol mL^-1

What is the mass of urea (NH₂CONH₂) required in making 2.5 kg of 0.25 molal aqueous solution?

1. 74 g

2. 69 g

3. 33 g

4. 37 g

Mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride is

1. 0.46

2. 0.54

3. 0.27

4. 0.35

The osmotic pressure of a solution prepared by dissolving 25 mg of K₂SO₄ in 2 litres of water at 25° C, assuming that it is completely dissociated is-

 $1. 2.76 \times {10}^{-3} \mathrm{atm}$
$2. 5.39 \times {10}^{-4} \mathrm{atm}$
$3. 5.27 \times {10}^{-3} \mathrm{atm}$
$4. 3.19 \times {10}^{-3} \mathrm{atm}$