1
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
The cell membranes are mainly composed of
A
fats
B
proteins
C
phospholipids
D
carbohydrates
2
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.
3
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
4
AIPMT 2005
MCQ (Single Correct Answer)
+4
-1
For a first order reaction A $$ \to $$ B the reaction rate a reactant concentration of 0.01 M is found to be 2.0 $$ \times $$ 10$$-$$5 mol L$$-$$1 s$$-$$1. The half-life period of the reaction is
A
30 s
B
220 s
C
300 s
D
347 s