401.

Which of the following is a colligative property?

• Surface tension

• Viscosity

• Osmotic pressure

• Vapour pressure

Four solutions A, B, C, D has glucose 0.5 M, NaCl 0.1 M, BaCl₂ 0.5 M and MgCl₂ 0.1 M, then which of the following will have highest osmotic pressure?

• Glucose

• BaCl₂

• MgCl₂

• NaCl

The highest boiling point is of

• FeCl₂

• FeCl₃

• Al₂(SO₄)₃

• AlCl₃

The volume strength of 1.5 N H₂O₂ solution is

• 8.4

• 4.8

• 5.2

• 8.8

On dissolving a non-volatile solute in a solvent, the vapour pressure of the solvent is decreased by 10 mm of mercury. The mole fraction of the solute in this solution is 0.2. If the vapour pressure of the solvent is decreased by 20 mm of mercury by dissolving more solute, what is the mole fraction of solvent in this solution now?

• 0.2

• 0.4

• 0.6

• 0.8

During osmosis, flow of water through a semi-permeable membrane is

• from both sides of semi-permeable membrane with equal flow rate

• from solution having lower concentration only

• from solution having higher concentration only

• None of the above

Out of the following fractions of petroleum the one having the lowest boiling point is

• kerosene oil

• diesel oil

• gasoline

• heavy oil

Two vessels containing gases A and B are interconnected as shown in the figure. The stopper is opened, the gases are allowed to mix homogeneously. The partial pressures of A and B in the mixture will be, respectively

• 8 and 5 atm

• 9.6 and 4 atm

• 4.8 and 2 atm

• 6.4 and 4 atm

If 0.1 M solutions of each electrolyte are taken and if all electrolytes are completely dissociated, then whose boiling point will be highest?

• Glucose

• KCl

• BaCl₂

• K₂[Fe(CN)₆]

The percentage composition by weight of an aqueous solution of a solute (molar mass 150) which boils at 373.26 K (k_b = 0.52) is

• 7

• 6

• 9

• 15