1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
If $$\alpha$$ is the degree of dissociation of Na2SO4, the vant Hoff’s factor (i) used for calculating the molecular mass is :
A
1 + $$\alpha$$
B
1 + $$2\alpha$$
C
1 - $$\alpha$$
D
1 - $$2\alpha$$
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Benzene and toluene form nearly ideal solutions. At 20 oC, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20 oC for a solution containing 78 g of benzene and 46 g of toluene in torr is
A
50
B
25
C
53.5
D
37.5
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Equimolar solutions in the same solvent have
A
Same boiling point but different freezing point
B
Same freezing point but different boiling point
C
Same boiling and same freezing points
D
Different boiling and different freezing points
4
AIEEE 2004
MCQ (Single Correct Answer)
+4
-1
Which of the following liquid pairs shows a positive deviation from Raoult’s law?
A
Water – hydrochloric acid
B
Acetone – chloroform
C
Water – nitric acid
D
Benzene – methanol
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