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Online Tests
ECAT Chemistry Chapter 4 Liquids & Solids Online Test MCQs With Answers
Question # 1
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 # 2
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 # 3
Debye forces are present in on 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 # 4
Amorphous solids:
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Have a sharp melting point
Undergo clean cleavage when cut with knife
Have a perfect arrangement of atoms
Can possesses small regions of orderly arrangement of atoms
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Question # 5
The boiling point of NH
3 is maximum among the hydrides of group V elementsdue to:
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Enhanced electronegative character of Nitrogen
Pyramidal structure of NH3
Very small size of Nitrogen.
Enhanced electropositive character of Nitrogen
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Question # 6
Which one of the following is weakest inter molecular force?
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Dipole induced dipole forces
Ionic dipole forces
Electrostatic forces b/w ions
Dipole dipole forces
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Question # 7
A liquid on evaporation causes:
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Heating effect.
Cooling effect.
Suffocation .
All of above
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Question # 8
Which of the following liquids has low vapour pressure at 25
°C:
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Diethyl ether
Acetone.
Water.
Ethyl alcohol.
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Question # 9
A liquid on evaporation causes
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Heating effect
Cooling effect
Suffication
All of above
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Question # 10
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 # 11
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 point
Lowering temperature only
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Question # 12
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 # 13
The molecules of CO
2
in dry ice from the
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Ionic crystalls
Covalent crystals
Molecular crystals
Any type of crystal
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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
Amorphous solids
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Have sharp melting point
Undergo clean cleavage when cut with knife
Have perfect arrangement of atoms
Can possesses small regions of orderly arrangement of atoms
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Question # 16
Hydrocarbon molecules 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 # 17
At sea level and at 100
°C the vapor pressure of water in an open system is:
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1000 mm Hg
760 mm Hg
730 mm Hg
670 mm Hg
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Question # 18
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 # 19
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 # 20
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 # 21
Which of the following is a pseudo solid
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CaF
2
Glass
NaCl
All
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Question # 22
The strongest forces are:
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Debye froces
London dispersion
Dipole-dipole attraction
Hydrogen bonding
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Question # 23
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 # 24
In a group on going downward, polarizability generally
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Decreases
Increases
Remains constant
Negligible
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Question # 25
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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Question # 26
Escape of high energy molecules from the surface of a liquid is called
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Sublimation
Distillation
Condensation
Evaporation
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Question # 27
The intermolecular forces in liquids are
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Negligible
Very weak
Very strong
Reasonably strong
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Question # 28
The inter-molecular forces in liquids are:
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Negligible
Very weak
Very strong
Reasonably strong
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Question # 29
Chloroform and acetone are soluble in each other due to
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Instantaneous dipole interactions
Dipole-dipole interactions
Intermolecular hydrogen bonding
All of above
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Question # 30
HF has exceptionally low acidic strengths due to
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Smaller size of fluorine
Strong polar bond between H and F
Electronegativity of fluorine
Strong hydrogen bonding
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