ECAT Pre Engineering Chemistry Chapter 4 MCQ Test With Answer

Question # 1

Which one of the following is the weakest intermolecular force

Dipole induced dipole forces A
Ionic dipole forces B
Electrostatics forces between ions C
Dipole-dipole forces D

Question # 2

Chloroform and acetone are soluble in each other due to

Instantaneous dipole interactions A
Dipole-dipole interactions B
Intermolecular hydrogen bonding C
All of above D

Question # 3

Debye forces are present in on of the following pairs:

Na+ion and water A
Argon and water B
Argon and Na+ion C
Ne and water D

Question # 4

London dispersion forces are also called:

Hydrogen bonding. A
Debye forces B
Van der Waal's forces C
Instantaneous dipole-induced dipole forces. D

Question # 5

Escape of high energy molecules from the surface of a liquid is called

Sublimation A
Distillation B
Condensation C
Evaporation D

Question # 6

Which of the following is a pseudo solid?

CaF₂
A
Glass
B
NaCL
C
All
D

Question # 7

Force of attraction between atoms of He is

London dispersion forces A
Hydrogen bondign B
Coordinate covalent bond C
Covalent bond D

Question # 8

Hydrocarbon molecule with large chain lengths experience:

Weaker attractive forces A
Stronger attractive forces B
Repulsive forces C
No attractive forces D

Question # 9

Ionic solids are characterized by :

Low meeting points A
Good conductivity in solid state B
High vapor pressure C
Solubility in polar solvents D

Question # 10

Amorphous solids:

Have a sharp melting point A
Undergo clean cleavage when cut with knife B
Have a perfect arrangement of atoms C
Can possesses small regions of orderly arrangement of atoms D

Question # 11

In a group on going downward, polarizability generally

Decreases A
Increases B
Remains constant C
Negligible D

Question # 12

Polypeptide chains are coiled about one another into a spiral by

Ionic bonds A
Covalent bonds B
Van der Waal's forces C
Hydrogen bonds D

Question # 13

Trend of boiling point of halogens from fluorine to Iodine is that it

Decreases A
Is negligible B
Increases C
Remains constant D

Question # 14

The molecules of CO₂in dry ice from the

Ionic crystalls A
Covalent crystals B
Molecular crystals C
Any type of crystal D

Question # 15

The gases can be converted into liquids by

increasing the pressure only A
Lowering temperature and increasing pressure B
Increasing pressure and bringing temperature below critical point C
Lowering temperature only D

Question # 16

London dispersion forces are alos called:

Hydrogen bonding. A
Debye forces B
Van der Waal's forces C
Instantaneous dipole-induced dipole forces. D

Question # 17

Rate of evaporation and rate of condensation at equilibrium:

Become very low A
Become very high B
Become equal C
Can never be equal. D

Question # 18

The boiling point of NH_{3 is maximum among the hydrides of group V elementsdue to:}

Enhanced electronegative character of Nitrogen A
Pyramidal structure of NH3 B
Very small size of Nitrogen. C
Enhanced electropositive character of Nitrogen D

Question # 19

A liquid on evaporation causes

Heating effect A
Cooling effect B
Suffication C
All of above D

Question # 20

Polypeptide chains are coiled about one another into a spiral by:

Ionic bonds A
Covalent bonds B
Van der Waal's forces C
Hydrogen bonds D

Question # 21

HF has exceptionally low acidic strength due to:

Smaller size of fluorine. A
Stronger polar bond between H and F. B
Electronegativity of fluorine C
Strong hydrogen bonding D

Question # 22

The intermolecular forces in liquids are

Negligible A
Very weak B
Very strong C
Reasonably strong D

Question # 23

At sea level and at 100⁰C the vapour pressure of water in an open system is

1000 mm Hg A
760 mm Hg B
730 mm Hg C
670 mm Hg D

Question # 24

The only forces are London dispersion forces among the

Atoms of He in gaseous state at high temperature A
Molecules of water in liquid state B
Molecules of solid I₂ C
Molecular of hydrochloric acid gas D

Question # 25

Hydrocarbon molecules with large chain lengths experience

Weaker attractive forces A
Stronger attractive forces B
Repulsive forces C
No attractive forces D

Question # 26

Chloroform and acetone are soluble in each other due to:

Instantaneous dipole interactions. A
Dipole-dipole interactions. B
Inter molecular hydrogen bonding. C
All of above D

Question # 27

H₂S is a gas which H₂O is liquid at room temperature. it is due to

Less intermolecular forces in water A
Covalent bond in H-O in water molecule B
Hydrogen bonding in water molecules C
Ionic characters in water molecules D

Question # 28

The molecules of CO_{2 in dry ice from the :}

Ionic crystals A
Coverlet crystals B
Molecular crystals C
Any type of crystals D

Question # 29

Diamond is a bad conductor because

It has a tight structure A
It has a high density B
there is no free electron present in the crystal of diamond of conduct electicity C
Is transparent to light D

Question # 30

Hydrogen bonding is present between the molecules of

NH₃ A
H₂O B
HF C
All of above D

Sr.#	Question	Answer
1	Hydrocarbon molecule with large chain lengths experience:	A. Weaker attractive forces B. Stronger attractive forces C. Repulsive forces D. No attractive forces
2	HF has exceptionally low acidic strength due to:	A. Smaller size of fluorine. B. Stronger polar bond between H and F. C. Electronegativity of fluorine D. Strong hydrogen bonding
3	Debye forces are present in one of the following pairs	A. Na⁺ion and water B. Argon and water C. Argon and Na⁺ion D. Ne and Water
4	Which of the following is a pseudo solid	A. CaF₂ B. Glass C. NaCl D. All
5	London dispersion forces are alos called:	A. Hydrogen bonding. B. Debye forces C. Van der Waal's forces D. Instantaneous dipole-induced dipole forces.
6	The intermolecular forces in liquids are	A. Negligible B. Very weak C. Very strong D. Reasonably strong
7	The density of water decreases, When it is freezed at 0°C	A. Change of bond length B. Change of bond angles C. Cubic structure of ice D. Empty spaces present in the structure of ice
8	HF has exceptionally low acidic strengths due to	A. Smaller size of fluorine B. Strong polar bond between H and F C. Electronegativity of fluorine D. Strong hydrogen bonding
9	A liquid on evaporation causes	A. Heating effect B. Cooling effect C. Suffication D. All of above
10	Hydrogen bonding is present between the molecules of	A. NH₃ B. H₂O C. HF D. All of above

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ECAT Pre Engineering Chemistry Chapter 4 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 4 Liquids & Solids

ECAT Chemistry Chapter 4 Liquids & Solids

Which one of the following is the weakest intermolecular force

Chloroform and acetone are soluble in each other due to

Debye forces are present in on of the following pairs:

London dispersion forces are also called:

Escape of high energy molecules from the surface of a liquid is called

Which of the following is a pseudo solid?

Force of attraction between atoms of He is

Hydrocarbon molecule with large chain lengths experience:

Ionic solids are characterized by :

Amorphous solids:

In a group on going downward, polarizability generally

Polypeptide chains are coiled about one another into a spiral by

Trend of boiling point of halogens from fluorine to Iodine is that it

The molecules of CO2in dry ice from the

The gases can be converted into liquids by

London dispersion forces are alos called:

Rate of evaporation and rate of condensation at equilibrium:

The boiling point of NH3 is maximum among the hydrides of group V elementsdue to:

A liquid on evaporation causes

Polypeptide chains are coiled about one another into a spiral by:

HF has exceptionally low acidic strength due to:

The intermolecular forces in liquids are

At sea level and at 1000C the vapour pressure of water in an open system is

The only forces are London dispersion forces among the

Hydrocarbon molecules with large chain lengths experience

Chloroform and acetone are soluble in each other due to:

H2S is a gas which H2O is liquid at room temperature. it is due to

The molecules of CO2 in dry ice from the :

Diamond is a bad conductor because

Hydrogen bonding is present between the molecules of

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The molecules of CO₂in dry ice from the

The boiling point of NH_{3 is maximum among the hydrides of group V elementsdue to:}

At sea level and at 100⁰C the vapour pressure of water in an open system is

H₂S is a gas which H₂O is liquid at room temperature. it is due to

The molecules of CO_{2 in dry ice from the :}