1.00g of a non- electrolyte solute (molar mass 250g mol-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, kf of benzene is 5.12 K kg mol-1, the freezing point of benzene will be lowered by.
0.4 K
0. 3 K
0.5 K
0. 2K.
A 0.0020 m aqueous solution of an ionic compound Co(NH3)5(NO2)CI freeze at -0.00732oC. Number of moles of ions inwhich 1 mole of ionic compound produces on being dissolved in water will be (kf = -1.86oC/m)
2
3
4
1
Formation of a solution from two components can be considered as
Solution so formed will be ideal, if
ΔHsoln = ΔH1 - ΔH2 - ΔH3
ΔHsoln = ΔH3 - ΔH1 - ΔH2
ΔHsoln = ΔH1 + ΔH2 + ΔH3
ΔHsoln = ΔH1 + ΔH2 - ΔH3
A solution contains non- volatile solute of molecular mass, M2. Which of the following can be used to calculate then molecular mass of solute in terms of osmotic pressure?
The mole fraction of the solute in one molal aqueous solution is.
0.027
0.036
0.018
0.009
A solution containing 10 g per dm3 of urea (molecular mass = 60 g mol-1) is isotonic with a 5% solution of a non-volatile solute is.
250 g mol-1
300 g mol-1
350 g mol-1
200 g mol-1
The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 moles of p and 3 mols of Q would be.
140 torr
20 torr
68 torr
72 torr
______________is not a colligative property.
Lowering of vapour pressure
Elevation in boiling point
Osmotic pressure
Freezing point
The lowest vapour pressure is exerted by__________________
Water
Mercury
Kerosene
Rectified Spirit
The lowering of vapour pressure of the solvent takes place on dissolving a non-volatile solute because______________________
the surface tension of the solution decreases
the density of the solution increases
the molecules of the solvent on the surface are replaced by the molecules of the solute
the viscosity of the solution increases
