Chemistry Question Bank

Calculate the mass of urea (NH₂CONH₂) required in making 0.25 molal aqueous solution using 2.5 L water. (Haryana PMT 2010)

An aqueous solution containing 1g of urea boils at 100.25ºC. The aqueous solution containing 3g of glucose in the same volume will boil at

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:

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion and carbonate ions respectively are (Molar mass…

What happens when an egg is kept in saturated solution of NaCl after removing its hard shell in dilute HCl? (OJEE 2010)

A solution has higher osmotic pressure than its standard solution. Which of the following term will be used for this solution? (OJEE 2012)

The concentration (in mol/L) of the solution having osmotic pressure 0.0821 atm at 300 K will be (AFMC 2009)

The molarity of a solution containing 5.0g of NaOH in 250 mL solution is (AFMC 2009)

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

Out of the compounds below, the vapour pressure of

Molarity of a given orthophosphoric acid solution is 3 M. Its normality is (KCET 2007)

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

An aqueous solution of methanol in water has vapour pressure (MP PMT 2007)

Van’t Hoff factor more than unity indicates that the solute in solution is (Manipal 2008)

Relative lowering of vapour pressure of a dilute solution is 0.2 what is the mole fraction of the non- volatile solute?

Assertion: One molal aqueous solution of glucose contains 180g of glucose in 1kg water. Reason: Solution containing one mole of solute in 1000 g of solvent is called one molal solution. (AIIMS 2008)

60 mL of N/5 H₂SO₄, 10 mL of N/2 HNO₃ and 30 mL of N/10 HCl are mixed together. The strength of the resulting mixture is (UP CPMT 2009)

A 6% solution of urea is isotonic with

A solution containing 10g per dm3 of urea (molecular mass = 60g mol–1) is isotonic with a 5% solution of a non-volatile solute. The molecular mass of this non-volatile solute is

Benzoic acid is dissolved in benzene, van’t Hoff factor will be

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?

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

Van’t Hoff factor more than unity indicates that the solute in solution has

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…

Calculate the molarity of Na₂CO₃ solution if the normality of Na₂CO₃ Solution is 0.2 N.