If 0.15 g of solute, dissolved in 15 g of solvent, is boiled at a temperature higher by 0.216oC, than that of the pure solvent, the molecular weight of the substance is ______________(molal elevation constant for the solvent is 2.16oC).
1.01
10
10.1
100
______________is not a colligative property.
Lowering of vapour pressure
Elevation in boiling point
Osmotic pressure
Freezing point
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 van't Hoff factor for an aqueous solution of Al2(SO4)3 is___________.
3
5
9
4
0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If kf for water is 1.86 K kg mol-1, the lowering in freezing point of the solution is
-1.12 k
0. 56 k
1.12 k
-0.56 k
A solution has 1 : 4 mole ratio of pentane to hexane. The vapour pressure of the pure hydrocarbons at 20oC are 440 mm of Hg for pentane and 120 mm of Hg for hexane. The mole fraction of pentane in the vapour phase would be
0.549
0.200
0.786
0.478
A 500g of tooth paste sample has 0.4g fluoride concentration. The concentration of fluoride in ppm is______________________
800
400
600
250
Which one of the following salts will have the same value of van't Hoff factor (i) as that of K4[Fe(CN)6]?
Al2(SO4)3
NaCI
AI(NO3)3
Na2SO4
If 0.1 M solution of glucose and 0.1 M solution of urea are placed on two sides of the semipermeable membrane to equal heights, then it will be correct to say that.
there will be no net movement across the membrane
Glucose will flow towards urea solution
Urea will flow towards glucose solution
Water will flow from urea solution to glucose
How many gram of a dibasic acid (mol wt 200) should be present in 100 ml. of the aqueous solution to give 0.1 N?
1g
2g
10g
20g
