JEE Main PYQs — Solutions

Which of the following graph correctly represents the plots of KH at 1 bar gases in water versus temperature? (Gases: O2, N2, He, CH4)

A solution is made by mixing one mole of volatile liquid A with 3 moles of volatile liquid B. The vapour pressure of pure A is 200 mm Hg and that of the solution is 500 mm Hg. The vapour pressure of…

Match List-I (Purification technique) with List-II (Mixture of organic compounds): List-I: (A) Distillation (simple), (B) Fractional distillation, (C) Distillation under reduced pressure, (D) Steam…

'x' g of NaCl is added to water in a beaker with a lid. The temperature of the system is raised from 1°C to 25°C. Which out of the following plots is best suited for the change in the molarity (M) of…

1.24 g of AX2 (molar mass 124 g mol-1) is dissolved in 1 kg of water to form a solution with boiling point of 100.0156°C, while 25.4 g of AY2 (molar mass 250 g mol-1) in 2 kg of water constitutes a…

Given below are two statements: Statement (I): NaCl is added to the ice at 0°C, present in the ice cream box to prevent the melting of ice cream. Statement (II): On addition of NaCl to ice at 0°C,…

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non volatile solute (molar mass 256 g mol-1) and the decrease in freezing point is 0.40 K?

Assume a living cell with 0.9\%\,(w/w) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water. (Consider the data upto first decimal…

Consider the given plots of vapour pressure (VP) vs temperature (T/K). Which amongst the following options is the correct graphical representation showing Tf, depression in the freezing point of…

Which of the following binary mixture does not show the behaviour of minimum boiling azeotropes?

The quantity which changes with temperature is:

If a substance 'A' dissolves in solution of a mixture of 'B' and 'C' with their respective number of moles as nA, nB and nC, mole fraction of C in the solution is:

The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is: (Given: Molar Mass Na: 23 and Cl: 35.5 g mol⁻¹)

What happens to freezing point of benzene when small quantity of naphthalene is added to benzene?

A solution of two miscible liquids showing negative deviation from Raoult's law will have:

Identify the mixture that shows positive deviations from Raoult's Law

We have three aqueous solutions of NaCl labelled as 'A', 'B' and 'C' with concentrations 0.1 M, 0.01 M and 0.001 M, respectively. The value of van't Hoff factor for these solutions will be in the…

The solution from the following with highest depression in freezing point/lowest freezing point is

0.05 M CuSO4 when treated with 0.01 M K2Cr2O7 gives green colour solution of Cu2Cr2O7. The two solutions are separated as shown below: [SPM: Semi Permeable Membrane] Due to osmosis:

What is the mass ratio of ethylene glycol (C2H6O2, molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and 250 mL of 0.25 molar aqueous solution?

In the depression of freezing point experiment A. Vapour pressure of the solution is less than that of pure solvent B. Vapour pressure of the solution is more than that of pure solvent C. Only solute…

What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0.20 mm Hg? (Assume dilute solution is being formed) Given: Vapour pressure of pure water is 54.2 mm Hg at…

Match List I with List II. | List I | | List II | |---|---|---| | A. van't Hoff factor, i | | I. Cryoscopic constant | | B. kf | | II. Isotonic solutions | | C. Solutions with same osmotic pressure |…

Evaluate the following statements for their correctness. A. The elevation in boiling point temperature of water will be same for 0.1 M NaCl and 0.1 M urea. B. Azeotropic mixture boil without change…

Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1:4. The…

Elevation in boiling point for 1.5 molal solution of glucose in water is 4 K. The depression in freezing point for 4.5 molal solution of glucose in water is 4 K. The ratio of molal elevation constant…

Given below are two statements: one is labelled as Assertion and the other is labelled as Reason. Assertion: At 10°C, the density of a 5 M solution of KCl [atomic masses of K & Cl are 39 & 35.5 g…

Boiling point of a 2% aqueous solution of a nonvolatile solute A is equal to the boiling point of 8% aqueous solution of a non-volatile solute B. The relation between molecular weights of A and B is.

Solute A associates in water. When 0.7 g of solute A is dissolved in 42.0 g of water, it depresses the freezing point by 0.2°C. The percentage association of solute A in water, is [Given: Molar mass…

The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L⁻¹ is 0.0405°C. Density of formic acid is 1.05 g mL⁻¹. The Van't Hoff factor of the formic acid solution…

Which one of the following 0.06 M aqueous solutions has lowest freezing point?

Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression?

The size of a raw mango shrinks to a much smaller size when kept in a concentrated salt solution. Which one of the following process can explain this?

Henry's constant (in kbar) for four gases , , and in water at 298 K is given below: | | | | | | |---|---|---|---|---| | KH | 50 | 2 | 2 10-5 | 0.5 | (density of water = 103 kg m⁻³ at 298 K) This…

A graph of vapour pressure and temperature for three different liquids X, Y and Z is shown below: The following inferences are made: (A) X has higher intermolecular interactions compared to Y. (B) X…

A set of solutions is prepared using 180 g of water as a solvent and 10 g of different non-volatile solutes A, B and C. The relative lowering of vapour pressure in the presence of these solutes are…

At 35°C, the vapour pressure of CS2, is 512 mm Hg and that of acetone is 144 mmHg. A solution of CS2 in acetone has a total vapour pressure of 600 mmHg. The false statement amongst the following is:

Two open beakers one containing a solvent and the other containing a mixture of that solvent with a non volatile solute are together sealed in a container. Over time:

A solution of sodium sulphate contains 92 g of Na+ ions per kilogram of water. The molality of Na+ ions in that solution in mol kg⁻¹ is:

The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality (in mol kg⁻¹) of the aqueous solution is:

The amount of sugar (C12H22O11) required to prepare 2 L of its 0.1 M aqueous solution is:

Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vapour pressure of pure A and pure B are 7 103 Pa and 12 103 Pa, respectively. The composition of the vapour in…

Which one of the following statements regarding Henry's law is not correct?

The osmotic pressure of a dilute solution of an ionic compound XY in water is four times that of a solution 0.01 M BaCl2 in water. Assuming complete dissociation of the given ionic compounds in…

At room temperature, a dilute solution of urea is prepared by dissolving 0.60 g of urea in 360 g of water. If the vapour pressure of pure water at this temperature is 35 mm Hg, lowering of vapour…

Molal depression constant for a solvent is 4.0 K kg mol⁻¹. The depression in the freezing point of the solvent for 0.03 mol kg⁻¹ solution of K2SO4 is: (Assume complete dissociation of the electrolyte)

The elevation in boiling point for 1 molal solution of glucose is 2 K. The depression in freezing point for 2 molal solution of glucose in the same solvent is 2 K. The relation between Kb and Kf is:

1 g of a non-volatile non-electrolyte solute is dissolved in 100 g of two different solvents A and B whose ebullioscopic constants are in the ratio of 1:5. The ratio of the elevation in their boiling…

A solution is prepared by dissolving 0.6 g of urea (molar mass = 60 g mol⁻¹) and 1.8 g of glucose (molar mass = 180 g mol⁻¹) in 100 mL of water at 27°C. The osmotic pressure of the solution is: (R =…

The freezing point of a diluted milk sample is found to be −0.2°C, while it should have been −0.5°C for pure milk. How much water has been added to pure milk to make the diluted sample?

K2HgI4 is 40% ionised in aqueous solution. The value of its van't Hoff factor (i) is:

The freezing point of a 4% aqueous solution of X is equal to the freezing point of a 12% aqueous solution of Y. If the molecular weight of X is A, then the molecular weight of Y will be

The vapour pressures of pure liquids A and B are 400 and 600 mm Hg respectively at 298 K. On mixing the two liquids, the sum of their volumes is equal to the volume of the final mixture. The mole…

Liquid M and liquid N form an ideal solution. The vapour pressures of pure liquids M and N are 450 and 700 mmHg, respectively, at the same temperature. Then correct statement is: (xM = Mole fraction…

Molecules of benzoic acid (C6H5COOH) dimerise in 30 g of benzene. 'w' g of benzoic acid shows a depression in freezing point equal to 2 K. If the percentage association of the acid to form dimer in…

For the solution of the gases w, x, y and z in water at 298 K, the Henry's law constants (KH) are 0.5, 2, 35 and 40 kbar, respectively. The correct plot for the given data is:

A solution containing 62 g ethylene glycol in 250 g water is cooled to −10°C. If Kf for water is 1.86 K kg mol⁻¹, the amount of water (in g) separated as ice is: