At 80^o C, the vapour pressure of pure liquid ‘A’ is 520 mm Hg and that of pure liquid ‘B’ is 1000 mm Hg. If a mixture solution of ‘A’ and ‘B’ boils at 80^o C and 1 atm pressure, the amount of ‘A’ in the mixture is (1 atm = 760 mm Hg)

• 52 mol percent

• 34 mol percent

• 48 mol percent

• 48 mol percent

The vapour pressure of water at 20^oC is 17.5 mm Hg. If 18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water at 20^oC, the vapour pressure of the resulting solution will be

• 17.675 mm Hg

• 15.750 mm Hg

• 16.500 mm Hg

• 16.500 mm Hg

23.

Equal masses of methane and oxygen are mixed in an empty container at 25ºC. The fraction of the total pressure exerted by oxygen is

• 2/3

• (1/3) x (273 / 298)

• 1/3

• 1/3

A 5.25% solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol^–1) in the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 gcm^–3, molar mass of the substance will be –

• 90.0g mol^–1

• 115.0g mol^–1

• 105.0g mol^–1

• 105.0g mol^–1

The density (in g mL^–1) of a 3.60 M sulphuric acid solution that is 29% H₂SO₄ (Molar mass = 98 g mol^-) by mass will be 

• 1.64

• 1.88

• 1.22

• 1.22

A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be

• 350

• 300

• 360

• 360

Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is

• 1.14 mol kg^–1

• 3.28 mol kg^–1

• 2.28 mol kg^–1

• 2.28 mol kg^–1

18 g of glucose (C₆H₁₂O₆) is added to 178.2 g of water. The vapour pressure of water for this aqueous solution at 100^o C is

• 759.00 Torr

• 7.60 Torr

• 76.00 Torr

• 76.00 Torr

The volume of a colloidal particle, V_C as compared to the volume of a solute particle in a true solution V_S, could be

The solubility product of a salt having general formula MX₂, in water is 4 x 10^-12. The concentration of M²⁺ ions in the aqueous solution of the salt is

• 2.0 x 10^-6 M

• 1.0 x 10^-4 M

• 1.6 x 10^-4 M

• 1.6 x 10^-4 M