1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
A solution of urea (mol. mass 56 g mol$$-$$1) boils at 100.18oC at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol$$-$$1 respectively, the above solution will freeze at
A
0.654oC
B
$$-$$ 0.654oC
C
6.54oC
D
$$-$$6.54oC
2
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
The cell membranes are mainly composed of
A
fats
B
proteins
C
phospholipids
D
carbohydrates
3
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
Electrolytic reduction of nitrobenzene in weakly acidic medium gives
A
N-phenylhydroxylamine
B
nitrosobenzene
C
aniline
D
p-hydroxyaniline.
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20oC are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be
A
0.200
B
0.549
C
0.786
D
0.478