MolSynapse / Question bank / Solutions and Colligative Properties / Relative lowering of vapour pressure

Relative lowering of vapour pressure

36 questions on Relative lowering of vapour pressure from the Solutions and Colligative Properties chapter: 7 NEET level, 14 JEE Main, 15 JEE Advanced. Each one opens with its answer and solution.

Practice this topic All Solutions and Colligative Properties topics

For a solution of a non-volatile solute, the relative lowering of vapour pressure (p^0 - p)/p^0 is equal to NEET level
Which of the following is a colligative property? NEET level
18 g of glucose (molar mass 180) is dissolved in 90 g of water (molar mass 18). The relative lowering of vapour pressure of water is NEET level
At 373 K pure water has vapour pressure 760 mmHg. The vapour pressure of a solution of 6.0 g urea (molar mass 60) in 180 g water (molar mass 18) at the same tem... JEE Main level
A solution of 3.0 g of a non-volatile non-electrolyte in 90 g of water shows a relative lowering of vapour pressure of 3.322x10^-3. Using Raoult's law exactly (... JEE Main level
Solution I contains 6.0 g of urea (molar mass 60) in 100 g of water. Solution II contains 18.0 g of a non-volatile non-electrolyte X in 100 g of water. The two ... JEE Main level
0.10 mol of NaCl is dissolved in 90 g of water (molar mass 18). Assume complete dissociation and treat every ion as an independent solute particle. The relative... JEE Main level
Which of the following aqueous solutions of equal molality has the HIGHEST vapour pressure at a given temperature (assume complete dissociation of electrolytes)... JEE Main level
The vapour pressure of pure water at 302 K is 31.80 mmHg. Find the lowering of vapour pressure, in mmHg, when 1.8 g of glucose (molar mass 180) is dissolved in ... JEE Main level
Which statements about relative lowering of vapour pressure for non-volatile solutes in a given solvent are correct? JEE Main level
In an Ostwald-Walker experiment dry air is passed first through bulbs containing a solution of 5.0 g of a non-volatile non-electrolyte in 90 g of water, then th... JEE Advanced level
Pure water has vapour pressure 23.8 mmHg at 298 K. A solution is prepared by dissolving 3.0 g of urea (molar mass 60) and 3.6 g of glucose (molar mass 180), bot... JEE Advanced level
0.10 mol of CaCl2 is dissolved in 100 g of water (molar mass 18). The salt is 80% dissociated (alpha = 0.80) into Ca^2+ and Cl-. Treating each ion as an indepen... JEE Advanced level
12.2 g of benzoic acid (molar mass 122) is dissolved in 156 g of benzene (molar mass 78), in which it is 80% associated into dimers (alpha = 0.80). The acid is ... JEE Advanced level
A non-volatile non-electrolyte (5.0 g) dissolved in 100 g of water (molar mass 18) lowers the vapour pressure from 760 mmHg to 745 mmHg. Using Raoult's law exac... JEE Advanced level
Four aqueous solutions each contain 5.0 mol of water: (X) 0.20 mol urea; (Y) 0.10 mol K2SO4; (Z) 0.15 mol NaCl; (W) 0.25 mol glucose. Assume complete dissociati... JEE Advanced level
An aqueous solution of a non-volatile non-electrolyte shows a relative lowering of vapour pressure of 0.0200 (molar mass of water 18). Which statements are corr... JEE Advanced level
Solution P contains 3.6 g glucose (molar mass 180) in 100 g of water. Solution Q contains w g of NaCl (molar mass 58.5) in 100 g of water and has the same vapou... JEE Advanced level
For a dilute solution of a non-volatile, non-electrolyte solute, the relative lowering of vapour pressure (P^0-P)/(P^0) is equal to NEET level
A non-volatile solute (0.25 mol) is dissolved in 4.75 mol of a volatile solvent whose vapour pressure when pure is 200 torr. Assuming Raoult's law, the vapour p... NEET level
Four aqueous solutions are each 0.1 m: glucose, urea, NaCl and CaCl2. Assuming complete dissociation of the electrolytes, which has the lowest vapour pressure a... NEET level
A binary liquid mixture shows negative deviation from Raoult's law. For the mixing process, which pair of signs is correct? NEET level
At 25 degC the vapour pressure of pure water is 23.8 torr. Find the vapour pressure of a solution of 10 g urea (molar mass 60 g mol^-1) in 90 g water. Use the i... JEE Main level
A non-volatile solute (12.0 g) dissolved in 90.0 g of water (18 g mol^-1) gives a relative lowering of vapour pressure of 0.0500. Do not use the dilute approxim... JEE Main level
Hexane (P^0=150 torr) and heptane (P^0=45 torr) form an ideal solution at a given temperature with mole fraction of hexane 0.40 in the liquid. The mole fraction... JEE Main level
0.10 mol of NaCl (assume complete dissociation) is dissolved in 1.00 kg of water (molar mass 18 g mol^-1). The relative lowering of vapour pressure is closest t... JEE Main level
The vapour pressure of pure water at 300 K is 27.0 torr. Find the vapour pressure (torr, two decimal places) of a solution of 36 g glucose (molar mass 180 g mol... JEE Main level
At a given temperature the pure liquids A and B have vapour pressures 140 torr and 65 torr. An ideal solution contains 3.0 mol of A and 4.0 mol of B. Calculate ... JEE Main level
For a dilute solution of a non-volatile, non-electrolyte solute in a volatile solvent, which statements are correct? JEE Main level
In an ideal binary solution with mole fraction of A equal to 0.40, the total vapour pressure is 600 torr. The vapour pressure of pure A is 800 torr. The vapour ... JEE Advanced level
5.85 g of NaCl (molar mass 58.5 g mol^-1, assume complete dissociation) is dissolved in 180 g of water (molar mass 18 g mol^-1). The pure-solvent vapour pressur... JEE Advanced level
Liquids A and B form an ideal solution. At a given temperature P_A^0=300 torr and P_B^0=100 torr. The vapour in equilibrium with a solution has mole fraction of... JEE Advanced level
At a certain temperature the vapour pressure of pure water is 760.0 mmHg. A solution of 18.0 g of a non-volatile non-electrolyte in 90.0 g of water (18 g mol^-1... JEE Advanced level
Two liquids A and B (P_A^0=200 torr, P_B^0=100 torr) are mixed in equimolar amounts. The measured total vapour pressure is 170 torr. Which statements are correc... JEE Advanced level
Four aqueous solutions are each made with 1.00 kg of water at the same temperature (assume complete dissociation for electrolytes): S1 has 0.20 mol glucose, S2 ... JEE Advanced level
An equimolar ideal liquid mixture of A (P^0=90 kPa) and B (P^0=30 kPa) is in equilibrium with its vapour. The vapour is condensed completely and the condensate ... JEE Advanced level