The van't Hoff factor for an aqueous solution of Al2(SO4)3 is
3
5
9
4
Molality is the most inconvenient way of expressing concentration because it
Has no unit
Is very difficult to find out
Involves difficult calculations
Involves the measurement of weight of liquids
A 500g of tooth paste sample has 0.4g fluoride concentration. The concentration of fluoride in ppm is
800
400
600
250
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?
1 g
2g
10g
20g
Blood cells retain their normal shape in solutions which are
hypotonic to blood
isotonic to blood
hypertonic to blood
equinormal to blood
Which of the following 0.10 M aqueous solution will have the lowest freezing point?
Al2(SO4)3
C5H10O5
KI
C12H22O11
Acetic acid is dissolved in benzene, and the molecular mass is determined from the elevation of boiling point. The molecular mass obtained will be
60
120
180
30
Which one of the following salts will have the same value of van't Hoff factor (i) as that of K4[Fe(CN)6]?
NaCl
Al(NO3)3
Na2SO4
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