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COMEDK Exam 2019 Solved Paper
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© examsiri.com
Question :
87 of 180
Marks:
+1
,
-0
6
g
of urea is dissolved in
90
g
of water. Relative lowering of vapour pressure is
0.02
0.2
0.002
0.04
Validate
Solution:
‌
p
∘
−
p
S
p
∘
=
‌
w
2
M
1
M
2
w
1
Where,
w
2
and
M
2
are weight and molecular mass of solute.
M
1
and
w
1
are molecular mass and weight of solvent.
‌
∆
p
p
∘
=
‌
6
60
×
‌
18
90
=
‌
1
50
=
0.02
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