If a hydrated crystal has vapour pressure greater than that of water vapour in the atmosphere, the crystal is __________________
Hygroscopic
Efflorescent
Deliquescent
Phosphorescent
A solution of urea (mol.mass 56 g mol-1) boils at 100.18oC at the atmosphere pressure. If kf and kb for water are 1.86 and 0.51 2 K kg mol-1 respectively, the above solution will freeze at.
-6.54oC
6.54oC
0.654oC
-0. 654oC
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
Molarity of liquid HCI, if density of solution is 1.17 g/cc is
36.5
18.25
32.05
42.10
A-B attraction force is greater than A - A and B- B
A - B attraction force is less than A - A and B - B
A- B attraction force remains same as A - A and B - B
Volume of solution is different from sum of volumes of solute and solvent
The vapour pressure, at a given temperature, of an ideal solution containing 0.2 mole of a non volatile solute and 0.8 mole of solvent is 60 mm of Hg. The vapour pressure of the pure solvent at the same temperature is.
150 mm of Hg
60 mm of Hg
75 mm of Hg
120 mm of Hg
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 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?
Which of the following 0.10 M aqueous solution will have the lowest freezing point?
Al2(SO4)3
C5H10O5
KI
C12H22O11
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