ECAT Pre Engineering Chemistry Chapter 4 MCQ Test With Answer

Question # 1

]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 # 2

A liquid on evaporation causes

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

Question # 3

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 # 4

Hydrocarbon molecules with large chain lengths experience

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

Question # 5

The strongest forces are

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

Question # 6

The inter-molecular forces in liquids are:

Negligible A
Very weak B
Very strong C
Reasonably strong D

Question # 7

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 # 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

Which of the following is a pseudo solid

CaF₂ A
Glass B
NaCl C
All D

Question # 10

In a group on going downward, polarizability generally

Decreases A
Increases B
Remains constant C
Negligible D

Question # 11

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 # 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

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

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 # 15

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 # 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

The intermolecular forces in liquids are

Negligible A
Very weak B
Very strong C
Reasonably strong D

Question # 18

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

Sublimation A
Distillation B
Condensation C
Evaporation D

Question # 19

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

Decreases A
Is negligible B
Increases C
Remains constant D

Question # 20

The density of water decreases, when it is freezed at 0^oC because of

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

Question # 21

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 # 22

Amorphous solids

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

Question # 23

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 # 24

Evaporation of water is possible at:

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

Question # 25

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

Diethyl ether A
Acetone B
Water C
Ethyl alochol D

Question # 26

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 # 27

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 # 28

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 # 29

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 # 30

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

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

Sr.#	Question	Answer
1	Evaporation of water is possible at:	A. Above 100°C B. 0°C C. 100°C D. At all temperature
2	At sea level and at 100⁰C the vapour pressure of water in an open system is	A. 1000 mm Hg B. 760 mm Hg C. 730 mm Hg D. 670 mm Hg
3	Trend of boiling point of halogens from fluorine to Iodine is that it	A. Decreases B. Is negligible C. Increases D. Remains constant
4	The molecules of CO_{2 in dry ice from the :}	A. Ionic crystals B. Coverlet crystals C. Molecular crystals D. Any type of crystals
5	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
6	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
7	London dispersion forces are also called:	A. Hydrogen bonding. B. Debye forces C. Van der Waal's forces D. Instantaneous dipole-induced dipole forces.
8	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
9	London dispersion forces are alos called:	A. Hydrogen bonding. B. Debye forces C. Van der Waal's forces D. Instantaneous dipole-induced dipole forces.
10	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

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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 of the following is a pseudo solid?

A liquid on evaporation causes

The molecules of CO2 in dry ice from the :