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Online Tests
ECAT Chemistry Chapter 4 Liquids & Solids Online Test MCQs With Answers
Question # 1
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 # 2
Which one of the following is the weakest intermolecular force
Choose an answer
Dipole induced dipole forces
Ionic dipole forces
Electrostatics forces between ions
Dipole-dipole forces
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Question # 3
The boiling point of NH
3 is maximum among the hydrides of group V elementsdue to:
Choose an answer
Enhanced electronegative character of Nitrogen
Pyramidal structure of NH3
Very small size of Nitrogen.
Enhanced electropositive character of Nitrogen
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Question # 4
The gases can be converted into liquids by
Choose an answer
increasing the pressure only
Lowering temperature and increasing pressure
Increasing pressure and bringing temperature below critical point
Lowering temperature only
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Question # 5
In a group on going downward, polarizability generally:
Choose an answer
Decreases
Increases
Remain constant
Negligible
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Question # 6
Ionic Solids are characterized by
Choose an answer
Low melting points
Good conductivity in solid state
High vapour pressure
Solubility in polar solvents
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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:
Choose an answer
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
Which of the following is a pseudo solid?
Choose an answer
CaF
2
Glass
NaCL
All
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Question # 9
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 # 10
Escape of high energy molecules from the surface of liquid is called:
Choose an answer
Sublimation.
Distillation.
Condensation.
Evaporation.
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Question # 11
The strongest forces are
Choose an answer
Debye forces
London dispersion forces
Dipole-dipole attraction
Hydrogen
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Question # 12
The molecules of CO
2
in dry ice from the
Choose an answer
Ionic crystalls
Covalent crystals
Molecular crystals
Any type of crystal
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Question # 13
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 # 14
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 # 15
Ionic solids are characterized by :
Choose an answer
Low meeting points
Good conductivity in solid state
High vapor pressure
Solubility in polar solvents
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Question # 16
The density of water decreases, when it is freezed at 0
o
C because of
Choose an answer
Change of bond lengths
Change of bond angles
Cubic structure of ice
Empty spaces present in the structure of Ice
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Question # 17
Which of the following is a pseudo solid
Choose an answer
CaF
2
Glass
NaCl
All
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Question # 18
Hydrogen bonding is present in one of the following pairs:
Choose an answer
NH
3
H
2
O
HF
All of above
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Question # 19
At sea level and at 100
°C the vapor 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 # 20
In a group on going downward, polarizability generally
Choose an answer
Decreases
Increases
Remains constant
Negligible
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Question # 21
The only forces are London dispersion forces among the
Choose an answer
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 # 22
The density of water decreases, When it is freezed at 0
°
C
Choose an answer
Change of bond length
Change of bond angles
Cubic structure of ice
Empty spaces present in the structure of ice
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Question # 23
Debye forces are present in one of the following pairs
Choose an answer
Na
+
ion and water
Argon and water
Argon and Na
+
ion
Ne and Water
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Question # 24
The inter-molecular forces in liquids are:
Choose an answer
Negligible
Very weak
Very strong
Reasonably strong
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Question # 25
Hydrocarbon molecules with large chain lengths experience
Choose an answer
Weaker attractive forces
Stronger attractive forces
Repulsive forces
No attractive forces
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Question # 26
Rate of evaporation and rate of condensation at equilibrium
Choose an answer
Become very low
Become very high
Become equal
Can never be equal
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Question # 27
Evaporation of water is possible at:
Choose an answer
Above 100
°C
0
°C
100
°C
At all temperature
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Question # 28
Chloroform and acetone are soluble in each other due to
Choose an answer
Instantaneous dipole interactions
Dipole-dipole interactions
Intermolecular hydrogen bonding
All of above
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Question # 29
London dispersion forces are also called:
Choose an answer
Hydrogen bonding.
Debye forces
Van der Waal's forces
Instantaneous dipole-induced dipole forces.
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Question # 30
Hydrogen bonding is present between the molecules of
Choose an answer
NH
3
H
2
O
HF
All of above
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Question # 31
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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