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Standard XII
Chemistry
Elevation in Boiling Point
Elevation of ...
Question
Elevation of boiling point of 1 molar aqueous glucose solution (density = 1.2 g/ml) is
A
K
b
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B
1.20
K
b
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C
1.02
K
b
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D
0.98
K
b
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Solution
The correct option is
B
0.98
K
b
Here 1 molar solution contains 1 mole of glucose in
1000
c
m
3
of solution.
molar mass of glucose=
180.156
g
(
m
o
l
)
−
1
mass of glucose=
1
×
180.56
=
180.56
g
mass of solution
=
d
e
n
s
i
t
y
×
v
o
l
u
m
e
=
1.2
×
1000
=
1200
g
mass of water=
1200
g
−
180.56
g
=
1019.44
g
=
1.01944
k
g
Δ
T
b
=
K
b
n
s
o
l
u
t
e
mass of solvent(in kg)
Δ
T
b
=
K
b
1
m
o
l
1.01944
k
g
=
0.98
K
b
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