Retro (Past 13 Years) JEE Main (Liquid Solution) - JEE MCQ

A 5.2 molal aqueous solution of methyl alcohol, CH₃OH, is supplied. What is the mole fraction of methyl alcohol in the solution ?

(AIEEE 2011)

Ethylene glycol is used as an a n tifre e z e in a cold climate. Mass of ethylene glycol which should be added to 4 kg of water to prevent it from freezing at - 6" C will be (K_f  for water = 1.86 K kg mol^-1 and molar mass of ethylene glycol = 62 g mol^-1 )

(AIEEE 2011)

The degree of dissociation (α) of a weak electrolyte, A_xB_y is related to van't Hoff factor (i) by the expression

(AIEEE 2011)

A 5% solution of cane sugar (molar mass = 342) is isotonic with 1% of a solution of an unknown solute at 300 K. The molar mass of unknown solute in g/mol is

(AIEEE 2011)

The molality of a urea solution in which 0.0100 g of urea, [(NH₂)₂CO] is added to 0.3000 dm³ of water at STP is

(AIEEE 2011)

If sodium sulphate is considered to be completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (ΔT_f), when 0.01 mole of sodium sulphate is dissolved in 1 kg of water, is

(AIEEE 2010)

On mixing, heptane and octane form an ideal solution. At 373 K, the vapour pressures of the two liquid components (heptane and octane) are 105 kPa and 45 kPa respectively. Vapour pressure of the solution obtained by mixing 25 g of heptane and 35 g of octane will be (molar mass of heptane = 100 g mol^-1 and of octane= 114 g mol^-1).

(AIEEE2010)

Two liquids X and Yform an ideal solution at 300 K, vapour pressure of the solution containing 1 mole of X and 3 moles of Y is 550 mm Hg. At the same temperature, if 1 mole of Y is further added to this solution, vapour pressure of the solution increases by 10 mm Hg. Vapour pressure (in mm Hg) of X and Y in their pure states will be, respectively

(AIEEE2009)

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statements is correct regarding the behaviour of the solution?

(AIEEE 2009)

At 80°C, the vapour pressure of pure liquid 'A' is 520 mm Hg ana tnai of pure liquid ‘B ’ is 1000 mm Hg. If a mixture solution of A' and ‘6 ’ boils at 80°C and 1 atm pressure, the amount of A ' in the mixture is

(1 atm = 760 mm Hg)

(AIEEE 2008)

The vapour pressure of water at 20°C is 17.5 mm Hg. If 18 g of glucose (C₆H₁₂0₆) is added to 178.2 g of water at 20°C, the vapour pressure of the resulting solution will be

(AIEEE 2008)

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

(AIEEE 2007)

The density (in g mL^-1)of a 3.60 M sulphuric acid solution that is 29% H₂S0₄ (molar mass = 98 g mol^-1) by mass will be

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 g cm^-3, molar mass of the substance will be

(AIEEE 2007)

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

(AIEEE 2006)

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

(AIEEE 2006)

Two solutions of a substance (non-electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?

(AIEEE 2005)

Equimolar solutions in the same solvent have

(AIEEE 2005)

Benzene and toluene form nearly ideal solutions. At 20°C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20°C for a solution containing 78 g of benzene and 46 g of toluene in torr is 

(AIEEE 2005)

 If α is the degree of dissociation of Na₂SO₄, the van’t Hoff factor (/) used for calculating the molecular mass is

(AIEEE 2005)

6.02 x 10²° molecules of urea are present in 100 mL of its solution. The concentration of urea solution is

(Avogadro constant, N_A = 6.02 x 10²³ mol^-1)

(AIEEE 2004)

To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H₃P0₃), the volume of 0.1 M aqueous KOH solution required is

(AIEEE 2004)

Which of the following liquid pairs shows a positive deviation from Raoult’s law?

(AIEEE 2004)

Which one of the following aqueous solutions will exhibit highest boiling point?

(AIEEE 2004)

Which one of the following statements is false?

(AIEEE 2004)

If liquid A and B form an ideal solution, the

(AIEEE 2003)

In a 0.2 molal aqueous solution of a weak acid HX, the degree of ionisation is 0.3. Taking K_f for water as 1.85, the freezing point of the solution will be nearest to

(AIEEE 2003)