The vant Hoffs factor 'i' accounts for

• extend of solubility

• extent of mobility of solute

• extent of dissolution of solute

• extent of dissociation of solute

When the pure solvent diffuses out of the solution through the semi-permeable membrane then the process is called

• sorption

• dialysis

• reverse osmosis

• osmosis

Which has the minimum freezing point ?

• One molal NaCl aq. solution

• One molal CaCl₂ aq. solution

• One molal KCl aq. solution

• One molal urea aq. solution

Which of the following aqueous solution has highest freezing point?

• 0.1 molal Al₂(SO₄)₃

• 0.1 molal BaCl₂

• 0.1 molal AlCl₃

• 0.1 molal NH₄Cl

If a solution containing 0.072 g atom of sulphur in 100 g of a solvent (k_f = 7.0) gave a freezing point depression of 0.84°C, the molecular formula of sulphur in the solutions is :

• S₆

• S₇

• S₈

• S₉

Which one of the following is not correct for an ideal solution ?

• It must obey Raoult's law

• $∆\mathrm{H} = 0$

• $∆\mathrm{C} = 0$

• $∆\mathrm{H} = ∆\mathrm{V} \ne 0$

Osmotic pressure of 0.4% urea solution is 1.64 atm and that of 3.42% cane sugar is 2.46 atm. When the above two solutions are mixed, the osmotic pressure of the resulting solution is :

• 0.82 atm

• 2.46 atm

• 1.64 atm

• 4.10 atm

448.

Which one of the following aqueous solutions will exhibit highest boiling point ?

• 0.01 M Na₂SO₄

• 0.01 M KNO₃

• 0.015 M urea

• 0.015 M glucose

Which of the following is not a colligative property?

• optical activity

• Osmotic pressure

• Depression of freezing point

• elevation of boiling point

The vapour pressure of pure liquid A is 0.80 atm. When a non volatile B is added to A its vapour pressure drops to 0.60 atm. The mole fraction of B in the solution is

• 0.125

• 0.25

• 0.5

• 0.75