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Online Tests
ECAT Chemistry Chapter 4 Liquids & Solids Online Test MCQs With Answers
Question # 1
In a group on going downward, polarizability generally
Choose an answer
Decreases
Increases
Remains constant
Negligible
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Question # 2
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 # 3
Which of the following liquids has low vapour pressure at 25
°C:
Choose an answer
Diethyl ether
Acetone.
Water.
Ethyl alcohol.
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Question # 4
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 # 5
Hydrogen bonding is present between the molecules of
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NH
3
H
2
O
HF
All of above
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Question # 6
Chloroform and acetone are soluble in each other due to:
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Instantaneous dipole interactions.
Dipole-dipole interactions.
Inter molecular hydrogen bonding.
All of above
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Question # 7
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 # 8
In a group on going downward, polarizability generally:
Choose an answer
Decreases
Increases
Remain constant
Negligible
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Question # 9
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 # 10
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 # 11
Trend of boiling point of halogens from fluorine to Iodine is that it
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Decreases
Is negligible
Increases
Remains constant
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Question # 12
A liquid on evaporation causes:
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Heating effect.
Cooling effect.
Suffocation .
All of above
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Question # 13
HF has exceptionally low acidic strength due to:
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Smaller size of fluorine.
Stronger polar bond between H and F.
Electronegativity of fluorine
Strong hydrogen bonding
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Question # 14
The intermolecular forces in liquids are
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Negligible
Very weak
Very strong
Reasonably strong
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Question # 15
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 # 16
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 # 17
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 # 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
Diamond is a bad conductor because:
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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
The strongest forces are
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Debye forces
London dispersion forces
Dipole-dipole attraction
Hydrogen
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Question # 21
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 # 22
Which of the following is a pseudo solid
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CaF
2
Glass
NaCl
All
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Question # 23
London dispersion forces are alos called:
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Hydrogen bonding.
Debye forces
Van der Waal's forces
Instantaneous dipole-induced dipole forces.
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Question # 24
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 # 25
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 # 26
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 # 27
The strongest forces are:
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Debye froces
London dispersion
Dipole-dipole attraction
Hydrogen bonding
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Question # 28
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 # 29
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 # 30
The density of water decreases, When it is freezed at 0
°
C
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Change of bond length
Change of bond angles
Cubic structure of ice
Empty spaces present in the structure of ice
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