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TS EAMCET 5-Aug-2021 Shift 1 Question Paper
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© examsnet.com
Question : 144
Total: 160
On mixing urea, the boiling point of
H
2
O
changed to
100.5
°
C
. Calculate the freezing point of the solution, if
K
f
of water is
1.87
K
.
kg
.
mol
−
1
and
K
b
of water is
0.52
K
.
kg
.
mol
−
1
−
1
°
C
−
0.5
°
C
−
1.8
°
C
0
°
C
Validate
Solution:
Given, boiling point of solution
=
100.5
∘
C
K
b
=
0.52
K
k
g
m
o
l
−
1
K
f
=
1.87
K
k
g
m
o
l
−
1
∆
T
boiling
=
100.5
−
100
=
0.5
∘
C
∆
T
=
K
b
×
molality
Molality
=
∆
T
∕
K
b
Molality
=
0.5
∕
0.52
∆
T
freczing
=
K
f
×
molality
=
1.87
×
0.5
∕
0.52
=
1.80
Now,
=
−
1.80
∘
C
© examsnet.com
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