Question

1) Vapour pressure of pure ‘A’ is 70 mm of Hg at 25oC.It forms an ideal solution with ‘B’ in which molefraction of A is 0.8. If the vapour pressure of the

solution is 84 mm of Hg at 25oC, the vapour pressure of pure ‘B’ at 25oC is :

a) 56 mm
b) 70 mm
c) 140 mm
d) 28 mm

2) An aqueous solution of methanol in water hasvapour pressure

a) Equal to that of water

b) Equal to that of methanol

c) More than that of water

d) Less than that of water

3)Vapour pressure of dilute aqueous solution of glucose is 750 mm of mercury at 373 K. The molefraction of the solute is :

a) 1/76
b) 1/7.6
c) 1/38
d) 1/10

4)The vapour pressure of water at 20oC is 17.5 mmHg. If 18 g glucose (C6H12O6) is added to 178.2 gof water at 20oC, the vapour pressure of the result-

ing solution will be :

a) 16.500 mm Hg
b) 17.325 mm Hg

c) 17.675 mm Hg
d) 15.750 mm Hg

5)An aqueous solution is 1.00 molal in KI. Whichchange will cause the vapour pressure of the solution to increase ?

a) Addition of water
b) Addition of NaCl

c) Addition of Na2SO4

d) Addition of 1.00 molal KI​

Answer 1

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1)option 3

2) option3

3)option1

4) option2

5) option1