Chemistry Question Bank

If boiling point of water is 1000C. How much gram of NaCl is added in 500 g of water to increase its boiling point by approx o b H O 1 C K 0.52K kg / mole. x (AllMS 2019)

The mixture which shows positive deviation from Raoult’s law is: (NEET 2020)

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)

In which mode of expression, the concentration of solution remains independent of temperature?

Molarity of a solution containing 1g NaOH in 250 ml of solution is

At high altitude the partial pressure of oxygen is less than that at the ground level. This leads to

If liquid A and B from ideal solutions

A non-ideal solution was prepared by mixing 30 mL chloroform and 50 mL acetone. The volume of mixture will be

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

Which of the following pairs shows a negative deviation from Raoult's law?

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:

Which one of the following pairs will not form an ideal solution?

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?