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Byju's Answer
Standard XII
Chemistry
Acidity of Carboxylic Acids
Benzophenone ...
Question
Benzophenone has freezing point 49^°C. 0.45 molal solution of urea in benzophenone has freezing point 44.59^°C. Find Kf of solvent.
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Similar questions
Q.
An aqueous solution of urea has freezing point
−
0.52
o
C
.
Then its molality will be:
(
K
f
=
1.86
0
C
/
m
)
Q.
A solution of urea in water has a boiling point of
100.18
∘
C
.
Calculate the freezing point of the same solution. Molal depression and elevation constants for water
K
f
and
K
b
are
1.86
∘
C
k
g
m
o
l
−
1
and
0.512
∘
C
k
g
m
o
l
−
1
respectively.
Q.
A solvent X freezes at
240
∘
C
. If
0.25
molal solution of a non volatile solute in pure X causes freezing point depression of
3
∘
C
, then
K
f
(in
K kg mol
−
1
) for solvent X is:
Assume complete association/dissociation of solute.
Q.
The freezing point of water is depressed by
0.37
∘
C
in a 0.01 molal
N
a
C
l
solution. The freezing point of 0.02 molal solution of the urea is depressed by:
Q.
An aqueous solution of urea has freezing point of
−
0.52
o
C
. Assume molarity and molality by same.
K
f
for
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2
O
is 1.86 K
m
o
l
−
1
k
g
. The osmotic pressure of solution at
27
o
C
in atm is (nearest integer)
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