ECAT Pre Engineering Chemistry Chapter 4 MCQ Test With Answer

Question # 1

Hydrogen bonding is present between the molecules of

NH₃ A
H₂O B
HF C
All of above D

Question # 2

Hydrocarbon molecules with large chain lengths experience

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

Question # 3

Hydrocarbon molecule with large chain lengths experience:

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

Question # 4

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 # 5

Which of the following liquids has low vapor pressure at 25°C:

Diethyl ether A
Acetone. B
Water. C
Ethyl alcohol. D

Question # 6

Heat of vapourization for liquids with strong dipole-dipole forces will have

Negligible Values A
Reasonably high values B
Very high values C
very low values D

Question # 7

Which of the following is a pseudo solid

CaF₂ A
Glass B
NaCl C
All D

Question # 8

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 # 9

Force of attraction b/w atoms of He is :

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

Question # 10

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 # 11

Force of attraction between atoms of He is

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

Question # 12

Debye forces are present in one of the following pairs

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

Question # 13

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 # 14

The strongest forces are

Debye forces A
London dispersion forces B
Dipole-dipole attraction C
Hydrogen D

Question # 15

London dispersion forces are also called

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

Question # 16

Diamond is a bad conductor because:

Ithas tight structure A
It has a high density B
There is no free electron present in the crystal of diamond of conduct electricity is transparent to light C

Question # 17

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 # 18

HF has exceptionally low acidic strengths due to

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

Question # 19

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 # 20

At sea level and at 100°C the vapor 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 # 21

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 # 22

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 # 23

Which of the following is a pseudo solid?

CaF₂
A
Glass
B
NaCL
C
All
D

Question # 24

The boiling point of NH₃is maximum among the hydrides of group V elements due 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 # 25

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 # 26

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

Sublimation A
Distillation B
Condensation C
Evaporation D

Question # 27

A liquid on evaporation causes:

Heating effect. A
Cooling effect. B
Suffocation . C
All of above D

Question # 28

Evaporation of water is possible at

Above 100⁰ A
0⁰ B
100⁰ C
At all temperature D

Question # 29

The molecules of CO₂in dry ice from the

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

Question # 30

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

Sublimation. A
Distillation. B
Condensation. C
Evaporation. D

Sr.#	Question	Answer
1	The intermolecular forces in liquids are	A. Negligible B. Very weak C. Very strong D. Reasonably strong
2	Which of the following liquids has low vapor pressure at 25°C:	A. Diethyl ether B. Acetone. C. Water. D. Ethyl alcohol.
3	The gases can be converted into liquids by:	A. Increasing the pressure only. B. Lowering temperature and increasing pressure C. Increasing pressure and bringing temperature below critical points D. Lowering temperature only
4	Polypeptide chains are coiled about one another into a spiral by	A. Ionic bonds B. Covalent bonds C. Van der Waal's forces D. Hydrogen bonds
5	The boiling point of NH₃is maximum among the hydrides of group V elements due to	A. Enhanced electronegative character of Nitrogen B. Pyramidal structure of NH₃ C. Very small size of Nitrogen D. Enhanced electropositive character of Nitrogen
6	The boiling point of NH_{3 is maximum among the hydrides of group V elementsdue to:}	A. Enhanced electronegative character of Nitrogen B. Pyramidal structure of NH3 C. Very small size of Nitrogen. D. Enhanced electropositive character of Nitrogen
7	The gases can be converted into liquids by	A. increasing the pressure only B. Lowering temperature and increasing pressure C. Increasing pressure and bringing temperature below critical point D. Lowering temperature only
8	Amorphous solids	A. Have sharp melting point B. Undergo clean cleavage when cut with knife C. Have perfect arrangement of atoms D. Can possesses small regions of orderly arrangement of atoms
9	Which of the following is a pseudo solid?	A. CaF₂ B. Glass C. NaCL D. All
10	A liquid on evaporation causes:	A. Heating effect. B. Cooling effect. C. Suffocation . D. All of above

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students