ECAT Pre Engineering Chemistry Chapter 4 MCQ Test With Answer

Question # 1

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 # 2

Which of the following is a pseudo solid

CaF₂ A
Glass B
NaCl C
All D

Question # 3

Force of attraction between atoms of He is

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

Question # 4

H₂S is a gas while H₂O is a liquid at room temperature. It is due to:

Less inter-molecular forces in water. A
Covalent bonding H-O in water molecule. B
Hydrogen bonding in water molecules C
Ionic character in water molecules D

Question # 5

Hydrogen bonding is present between the molecules of

NH₃ A
H₂O B
HF C
All of above D

Question # 6

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 # 7

Evaporation of water is possible at:

Above 100°C A
0°C B
100°C C
At all temperature D

Question # 8

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 # 9

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 # 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

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

Decreases A
Is negligible B
Increases C
Remains constant D

Question # 12

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 # 13

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 # 14

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 # 15

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

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

Question # 16

The strongest forces are

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

Hydrogen bonding is present in one of the following pairs:

NH₃ A
H₂O B
HF C
All of above D

Question # 19

The intermolecular forces in liquids are

Negligible A
Very weak B
Very strong C
Reasonably strong D

Question # 20

Ionic Solids are characterized by

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

Question # 21

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 # 22

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 # 23

]Which of the following is a pseudo solid?

Atoms of He is gaseous stat at high temperate. A
Molecules of water in liquid state. B
Molecules of solid l₂ C
Molecular of hydrochloric acid gas D

Question # 24

Hydrocarbon molecules with large chain lengths experience

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

Question # 25

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

Sublimation A
Distillation B
Condensation C
Evaporation D

Question # 26

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 # 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 density of water decreases, When it is freezed at 0°C

Change of bond length A
Change of bond angles B
Cubic structure of ice C
Empty spaces present in the structure of ice D

Question # 29

Which of the following liquids has low vapour pressure at 25⁰C

Diethyl ether A
Acetone B
Water C
Ethyl alochol D

Question # 30

In a group on going downward, polarizability generally

Decreases A
Increases B
Remains constant C
Negligible D

Sr.#	Question	Answer
1	Trend of boiling point of halogens from fluorine to Iodine is that it	A. Decreases B. Is negligible C. Increases D. Remains constant
2	Which of the following liquids has low vapour pressure at 25⁰C	A. Diethyl ether B. Acetone C. Water D. Ethyl alochol
3	Escape of high energy molecules from the surface of a liquid is called	A. Sublimation B. Distillation C. Condensation D. Evaporation
4	Escape of high energy molecules from the surface of liquid is called:	A. Sublimation. B. Distillation. C. Condensation. D. Evaporation.
5	Evaporation of water is possible at	A. Above 100⁰ B. 0⁰ C. 100⁰ D. At all temperature
6	The strongest forces are	A. Debye forces B. London dispersion forces C. Dipole-dipole attraction D. Hydrogen
7	Which one of the following is weakest inter molecular force?	A. Dipole induced dipole forces B. Ionic dipole forces C. Electrostatic forces b/w ions D. Dipole dipole forces
8	The intermolecular forces in liquids are	A. Negligible B. Very weak C. Very strong D. Reasonably strong
9	Amorphous solids:	A. Have a sharp melting point B. Undergo clean cleavage when cut with knife C. Have a perfect arrangement of atoms D. Can possesses small regions of orderly arrangement of atoms
10	Debye forces are present in on of the following pairs:	A. Na+ion and water B. Argon and water C. Argon and Na+ion D. Ne and water

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