If a hydrated crystal has vapour pressure greater than that of water vapour in the atmosphere, the crystal is __________________
Hygroscopic
Efflorescent
Deliquescent
Phosphorescent
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
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 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 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
Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL-1. Volume of acid required to make one litre of 0.1 M H2SO4 solution is
11.10 mL
16.65 ml
22.20 mL
5.55 mL
The better concentration term when the amount of solute is very small is_______________
Molarity
Molality
Parts per million
Mole fraction
Which of the following aqueous solutions has minimum freezing point?
0.01 m NaCI
0.005 m MgI2
0.005 m C2H5OH
0.005 m MgSO4
The van't Hoff factor for an aqueous solution of Al2(SO4)3 is___________.
3
5
9
4
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
