Raoult's law, ideal and non-ideal solutions, azeotropes

37 questions on Raoult's law, ideal and non-ideal solutions, azeotropes from the Solutions and Colligative Properties chapter: 8 NEET level, 16 JEE Main, 13 JEE Advanced. Each one opens with its answer and solution.

• According to Raoult's law, for a component of an ideal binary solution the partial vapour pressure is NEET level
• For an ideal solution formed from two liquids, which pair of conditions holds? NEET level
• Which of the following binary mixtures shows negative deviation from Raoult's law? NEET level
• Two liquids A and B form an ideal solution with x_A = x_B = 0.5. The vapour pressures of pure A and B at 300 K are 75 torr and 22 torr. The total vapour pressur... NEET level
• An ideal solution is prepared from 117 g of benzene (molar mass 78) and 46 g of toluene (molar mass 92). At the temperature of interest the pure vapour pressure... JEE Main level
• At a certain temperature pure liquids A and B have vapour pressures 900 mmHg and 500 mmHg. They form an ideal solution. The mole fraction of A in a liquid mixtu... JEE Main level
• Liquids A and B form an ideal solution. At a given temperature p_A^0 = 400 mmHg and p_B^0 = 200 mmHg. For a liquid mixture with x_A = 0.40, find the mole fracti... JEE Main level
• Which of the following describes a maximum-boiling azeotrope? JEE Main level
• An ideal solution of A and B has p_A^0 = 200 torr and p_B^0 = 100 torr. The vapour in equilibrium with it contains equal mole fractions of A and B (y_A=0.5). Fi... JEE Main level
• Which statements are true for an ideal binary solution of A and B? JEE Main level
• Which of the following binary mixtures show positive deviation from Raoult's law? JEE Main level
• An ideal liquid mixture of A (p^0 = 300 torr) and B (p^0 = 100 torr) is in equilibrium with a vapour that contains equal numbers of moles of A and B. The mole f... JEE Main level
• Liquids A (boiling point 83 degC) and B (boiling point 100 degC) form a mixture that has a constant-boiling azeotrope at 120 degC under 1 atm. Which statements ... JEE Advanced level
• For an ideal mixture of A and B at fixed temperature, the total vapour pressure is 280 torr when x_A = 0.30 and 340 torr when x_A = 0.60. Find the mole fraction... JEE Advanced level
• An ideal solution is made from 60 g of A (molar mass 120 g mol^-1) and 90 g of B (molar mass 60 g mol^-1). The pure vapour pressures are p_A^0 = 360 torr and p_... JEE Advanced level
• An ideal binary liquid of A and B (p_A^0 = 200 torr, p_B^0 = 50 torr) with x_A = 0.50 is partly vaporised. The vapour is completely condensed to a liquid, which... JEE Advanced level
• At a fixed temperature the vapour pressure of pure A is 300 torr and that of pure B is 250 torr. A solution with x_A = 0.50 shows a measured total vapour pressu... JEE Advanced level
• Two ideal solutions of A and B are made at one temperature, with p_A^0 = 500 torr and p_B^0 = 100 torr. Solution 1 has x_A = 0.20 and solution 2 has x_A = 0.60.... JEE Advanced level
• An ideal liquid mixture contains components A, B and C in the mole ratio 2:3:5. The pure vapour pressures are 120, 80 and 40 torr respectively. The mole fractio... JEE Advanced level
• Which of the following mixtures forms a minimum-boiling azeotrope? NEET level
• For a binary liquid mixture at a fixed temperature, pure A has vapour pressure 200 torr and pure B has 100 torr. For a liquid with x_A=0.40 the measured partial... JEE Advanced level
• At 100 degC the vapour pressure of pure water is 760 mmHg. When 6.0 g of a non-volatile non-electrolyte is dissolved in 90 g of water, the vapour pressure falls... JEE Main level
• An aqueous solution contains 20% urea by mass (molar masses: urea 60, water 18 g mol^-1). The vapour pressure of pure water at 30 degC is 31.8 mmHg. Treating ur... JEE Main level
• Liquids A and B form an ideal solution with pure-liquid vapour pressures p_A^0=400 torr and p_B^0=120 torr at a given temperature. A liquid mixture is at equili... JEE Advanced level
• The vapour pressure of pure water at 25 degC is 23.8 mmHg. A solution is prepared by dissolving 90 g of glucose (molar mass 180 g mol^-1) in 180 g of water (mol... JEE Main level
• What mass of glucose (molar mass 180 g mol^-1) must be dissolved in 250 g of water (molar mass 18 g mol^-1) to lower the vapour pressure of water by 2.0% of its... JEE Main level
• A binary liquid mixture shows positive deviation from Raoult's law. Which pair of signs is correct for the mixing process? NEET level
• Two liquids A and B form an ideal solution. The vapour pressures of pure A and pure B at 300 K are 150 torr and 60 torr. For a liquid with mole fraction x_A = 0... JEE Main level
• Which of the following pairs of liquids is expected to form a nearly ideal solution? NEET level
• At 300 K pure liquid A and pure liquid B have vapour pressures 300 torr and 200 torr. An equimolar liquid mixture of A and B is found experimentally to have a t... JEE Main level
• Liquids A and B form an ideal solution. The total vapour pressure at a fixed temperature is 440 torr when x_A=0.20 and 520 torr when x_A=0.60 (liquid-phase mole... JEE Advanced level
• Liquids A and B form an ideal solution at a fixed temperature, with p_A^0=300 torr and p_B^0=100 torr. A liquid mixture has x_A=0.25. Which statements are corre... JEE Advanced level
• Components A and B have normal boiling points of 80 degC (A) and 100 degC (B). They form a binary mixture showing large positive deviation from Raoult's law, wi... JEE Advanced level
• For a solution of a non-volatile solute in a volatile solvent, Raoult's law states that the relative lowering of vapour pressure, (p^0-p)/(p^0), is equal to the NEET level
• Benzene and toluene form an ideal solution. At a certain temperature the vapour pressures of pure benzene and pure toluene are 120 torr and 40 torr. A liquid mi... JEE Main level
• A binary liquid mixture of acetone and chloroform shows negative deviation from Raoult's law. Which of the following statements are correct? JEE Main level
• Liquids A and B (p_A^0=200 torr, p_B^0=80 torr at the working temperature) form an ideal solution. A mixture of 0.60 mol of A and 0.40 mol of B is prepared, and... JEE Advanced level