19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The mixture which shows positive deviation from Raoult’s law is: (NEET 2020)
The freezing point depression constant f K of benzene is 5.12 K kg mol-1. The freezing point depression for the solution of molality 0.078 m containing a non- electrolyte solute in benzene is (rounded off upto two dec…
A solution containing 12.5g of non-electrolyte substance in 185g of water shows boiling point elevation of 0.80 K. Calculate the molar mass of the substance. SOLUTIONS (Kb = 0.52 K kg mol-1)
Which of the following concentration terms is/are independent of temperature?
At high altitude the partial pressure of oxygen is less than that at the ground level. This leads to
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to .............
A mixture of benzene and toluene forms
Which of the following liquid pairs shows a positive deviation from Raoult's law?
Which of the following liquid pairs shows a positive deviation from Raoult’s law?
A solution of acetone in ethanol
The vapour pressure of acetone at 20°C is 185 torr. When 1.2g of a non-volatile substance was dissolved in 100 g of acetone at 20°C, its vapour pressure was 183 torr. The molar mass (g mol–1) of the substance is:
An aqueous solution of methanol in water has vapour pressure (MP PMT 2007)
Colligative properties of the solution depend on
2g of sugar is added to one litre of water to give sugar solution. What is the effect of addition of sugar on the boiling point and freezing point of water?
At certain hill-station, pure water boils at 99.725ºC. If Kb for water is 0.513ºC kg mol–1, the boiling point of 0.69m solution of urea will be
The relative lowering of the vapour pressure is equal to the ratio between the numbers of
What happens to freezing point of benzene when naphthalene is added?
The order of boiling points of four equimolar aqueous solutions is C < B < A < D. The correct order of their freezing points is
If the elevation in boiling point of a solution of 10gm of solute (mol. wt. = 100) in 100 gm of water is bT , then ebullioscopic constant of water is
Depression of freezing point for …(i)… is directly proportional to …(ii)… Here, (i) and (ii) refer to
If at certain temperature, the vapour pressure of pure water is 25 mm Hg and that of a very dilute aqueous urea solution is 24.5 mm Hg, the molality of the solution is
Relative lowering of vapour pressure of a dilute solution is 0.2 what is the mole fraction of the non- volatile solute?
Vapour pressure of dilute aqueous solution of glucose is 750 mm of Hg at 373 K. The mole fraction of solute is (vapour pressure of pure water is 760 mm of Hg) SOLUTIONS
The vapour pressure of benzene at a certain temp. is 640 mm Hg . A non-volatile-non-electrolyte solid weighing 2.175g is added to 39.0 g of benzene. The vapour pressure of the solution is 600 mm Hg. What is the molecu…
Vapour pressure of a pure liquid X is 2 atm at 300 K. It is lowered to 1 atm on dissolving 1g of Y in 20g of liquid X. If molar mass of X is 200, what is the molar mass of Y?