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Online Tests
ECAT Chemistry Chapter 4 Liquids & Solids Online Test MCQs With Answers
Question # 1
Polypeptide chains are coiled about one another into a spiral by:
Choose an answer
Ionic bonds
Covalent bonds
Van der Waal's forces
Hydrogen bonds
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Question # 2
The molecules of CO
2 in dry ice from the :
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Ionic crystals
Coverlet crystals
Molecular crystals
Any type of crystals
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Question # 3
In a group on going downward, polarizability generally:
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Decreases
Increases
Remain constant
Negligible
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Question # 4
Escape of high energy molecules from the surface of liquid is called:
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Sublimation.
Distillation.
Condensation.
Evaporation.
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Question # 5
Force of attraction between atoms of He is
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London dispersion forces
Hydrogen bondign
Coordinate covalent bond
Covalent bond
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Question # 6
Diamond is a bad conductor because
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It has a tight structure
It has a high density
there is no free electron present in the crystal of diamond of conduct electicity
Is transparent to light
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Question # 7
H
2
S is a gas while H
2
O is a liquid at room temperature. It is due to:
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Less inter-molecular forces in water.
Covalent bonding H-O in water molecule.
Hydrogen bonding in water molecules
Ionic character in water molecules
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Question # 8
The only forces are London dispersion forces among the
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Atoms of He in gaseous state at high temperature
Molecules of water in liquid state
Molecules of solid I
2
Molecular of hydrochloric acid gas
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Question # 9
The strongest forces are
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Debye forces
London dispersion forces
Dipole-dipole attraction
Hydrogen
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Question # 10
Heat of vapourization for liquids with strong dipole-dipole forces will have
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Negligible Values
Reasonably high values
Very high values
very low values
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Question # 11
The strongest forces are:
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Debye froces
London dispersion
Dipole-dipole attraction
Hydrogen bonding
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Question # 12
Debye forces are present in one of the following pairs
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Na
+
ion and water
Argon and water
Argon and Na
+
ion
Ne and Water
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Question # 13
Escape of high energy molecules from the surface of a liquid is called
Choose an answer
Sublimation
Distillation
Condensation
Evaporation
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Question # 14
The gases can be converted into liquids by:
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Increasing the pressure only.
Lowering temperature and increasing pressure
Increasing pressure and bringing temperature below critical points
Lowering temperature only
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Question # 15
London dispersion forces are also called
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Hydrogen bonding
Debye forces
Van de Waal's forces
Instantaneous dipole-induced dipole forces
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Question # 16
A liquid on evaporation causes:
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Heating effect.
Cooling effect.
Suffocation .
All of above
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Question # 17
Ionic solids are characterized by :
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Low meeting points
Good conductivity in solid state
High vapor pressure
Solubility in polar solvents
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Question # 18
Hydrocarbon molecule with large chain lengths experience:
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Weaker attractive forces
Stronger attractive forces
Repulsive forces
No attractive forces
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Question # 19
Diamond is a bad conductor because:
Choose an answer
It
has tight structure
It has a high density
There is no free electron present in the crystal of diamond of conduct electricity is transparent to light
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Question # 20
Which of the following liquids has low vapor pressure at 25
°C:
Choose an answer
Diethyl ether
Acetone.
Water.
Ethyl alcohol.
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Question # 21
HF has exceptionally low acidic strength due to:
Choose an answer
Smaller size of fluorine.
Stronger polar bond between H and F.
Electronegativity of fluorine
Strong hydrogen bonding
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Question # 22
The boiling point of NH
3
is maximum among the hydrides of group V elements due to
Choose an answer
Enhanced electronegative character of Nitrogen
Pyramidal structure of NH
3
Very small size of Nitrogen
Enhanced electropositive character of Nitrogen
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Question # 23
Rate of evaporation and rate of condensation at equilibrium
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Become very low
Become very high
Become equal
Can never be equal
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Question # 24
Which of the following is a pseudo solid?
Choose an answer
CaF
2
Glass
NaCL
All
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Question # 25
Trend of boiling point of halogens from fluorine to Iodine is that it
Choose an answer
Decreases
Is negligible
Increases
Remains constant
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Question # 26
Ionic Solids are characterized by
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Low melting points
Good conductivity in solid state
High vapour pressure
Solubility in polar solvents
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Question # 27
At sea level and at 100
0
C the vapour pressure of water in an open system is
Choose an answer
1000 mm Hg
760 mm Hg
730 mm Hg
670 mm Hg
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Question # 28
Which one of the following is the weakest intermolecular force
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Dipole induced dipole forces
Ionic dipole forces
Electrostatics forces between ions
Dipole-dipole forces
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Question # 29
A liquid on evaporation causes
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Heating effect
Cooling effect
Suffication
All of above
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Question # 30
The intermolecular forces in liquids are
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Negligible
Very weak
Very strong
Reasonably strong
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