A solution containing components A and B follows Raoult's law, when
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
If a hydrated crystal has vapour pressure greater than that of water vapour in the atmosphere, the crystal is __________________
Hygroscopic
Efflorescent
Deliquescent
Phosphorescent
Which of the following 0.10 M aqueous solution will have the lowest freezing point?
Al2(SO4)3
C5H10O5
Kl
C12H22O11
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
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
A solution of acetone in ethanol
Shows a negative deviation from Raoult's law
Shows a positive deviation from Raoult's law
Hehave like a near ideal solution
Obeys Raoult's law
During osmosis, flow of water through a semi permeable membrane is
From solution having higher concentration only
From both sides of semi-permeable membrane with equal flow rates
From both sides of semi-permeable membrane with unequal flow rates
From solution having lower concentration only
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
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
The better concentration term when the amount of solute is very small is_______________
Molarity
Molality
Parts per million
Mole fraction
