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Liquids and Solids - 9
1.
Evaporation of water is possible at
a) At all temperature
b) Above 100
o
C
c) 0
o
C
d) 100
o
C
2.
Boiling point is low for liquids with.
a) Very low vapour pressure.
b) Low vapour pressure at given temp.
c) High Vapour pressure at given temp.
d) Very high vapour pressure
3.
At equilibrium rate of evaporation and rate of condensation.
a) Become equal
b) can never be equal
c) become very low
d) Become very high
4.
In an open system vapour pressure of water at 100
o
C at Sea level is
a) 760 mm of Hg
b) 670 mm of Hg
c) 1000 mm of Hg
d) 700 mm of Hg
5.
Molar heat of vapourization of water is
a) 14.06 KJ/mole
b) 40.6 KJ/mole
c) 140.6 KJ/mole
d) 18 KJ/mole
6.
When external pressure is 23.7 torr, boiling point of water is
a) 25
o
C
b) 98
o
C
c) 200
o
C
d) 100
o
C
7.
Distillation under very reduced pressure is called.
a) distillation
b) fractional distillation
c) Destruetine distallation
d) Vacuum Destructive distallation
8.
Water may boil at 120
o
C when external pressure is
a) 1489 mm of Hg
b) 100 mm of Hg
c) 760 mm of Hg
d) 700 mm of Hg
9.
Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called.
a) Molar heat of sublimation
b) Latent heat of fusion
c) Heat of vapourization
d) Molar heat of fusion
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