Home/ECAT/ECAT Chemistry Liquids Test Online

ECAT Chemistry Liquids Test Online

Mustansar KhanLast Updated: April 19, 2025

Chemistry Liquids MCQS Online Test

ECAT Chemistry Liquids Chapter Online Test

Total Questions:	45
Time Allowed:	20 Minutes
Total Marks:	45
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	ECAT Entry Test Chemistry Online Test Interview Questions about Chemisttry All Universities Entrance Test Recruitments Tests

ECAT Chemistry Liquids Test

Please wait...

Page 1 of 2

Chemistry

1. London dispersion forces are the only force present among the

Molecules of hydrogen chloride gas

Molecules of solid iodine

Molecules of water in liquids state

Atoms if helium in gaseous state at high temperature

2. Which one of the following statements about negative ions is incorrect?

They are formed when atoms gain electrons

They are also known as anions

They are larger than the atom from which they were formed

They are formed only in metals

3. The strength of dipole-dipole forces depends upon

Electro negativity difference

Both A & B

Electro positivity difference

Distance between atoms

4. An 8.29 g sample of calcium carbonate [CaCO₃(s)] absorbs 50.3 J of heat, upon which the temperature of the sample increases from 21.1 °C to 28.5 °C. What is the specific heat of calcium carbonate?

1.1

.82

.63

2.2

5. Amorphous substances possess

Sharp B.P.

No definite heat of fusion

Definite heat of fusion

Sharp melting points

6. Stronger the intermolecular forces

Lower the Vapour pressure

None

Greater the Vapour pressure

May be smaller or greater

7. How are the boiling and freezing point of a sample of water affected when salt is dissolved in the water?

The boiling decreases and the freezing point decreases.

The boiling point decreases and the freezing point increases.

The boiling point increases and the freezing point decreases.

The boiling point increases and the freezing point increases.

8. The forces present between the ions and water molecules are called

Dipole – dipole forces

London dispersion forces

Ion – dipole forces

Dipole – induced dipole forces

9. London dispersion forces are also called

Ion-dipole forces

Dipole-dipole forces

Dipole-induced dipole forces

Instantaneous dipole induced dipole forces

10. The attracted forces which are created due to repulsion of electronic cloud of the molecules are

Ion-dipole forces

Dipole – dipole forces

Instantaneous dipole – induced dipole forces

Dipole – induced dipole forces

11. What amount of heat (in kJ) is required to melt 35.0 g of ice at 0°C?

3.09 kJ

20.9 kJ

79.1 kJ

11.7 kJ

12. Two droplets merge with each other and forms a large droplet. In this process

Energy is absorbed

Energy is liberated

Some mass is converted into energy

Neither liberated nor absorbed

13. When water freezes at 0c its density decreases due to

Cubic structure of ice

Change of bond length

Change of bond angles

Empty space presenting structure of ice

14. The quantity of heat required to convert one mole of liquid into its vapors at its boiling point is called heat of

Crystallization

Evaporation

Vaporization

Sublimation

15. Water has maximum density at

4C°

0C°

2C°

100C°

16. On mixing the salt in water, the surface tension of water will

Increase

Remains unchanged

None of these

Decrease

17. Water has a specific heat of 4.184 J/g deg while glass (Pyrex) has a specific heat of 0.780 J/g deg. If 10.0 J of heat is added to 1.00 g of each of these, which will experience the larger increase of temperature?

None of these

They both will experience the same change in temperature since only the amount of a substance relates to the increase in temperature

Water

Glass

18. In order to mention B.P of H₂O at 110°C, the external pressure should be

Any value of pressure

765 torr

Between 200 torr and 760 torr

Between 760 torr and 1200 torr

19. Which one of the following is not a form of chemical bonding?

Metallic bonding

Covalent bonding

Hydrogen bonding

Ionic bonding

20. Which of the following statements in incorrect?

The boiling point of noble gases increases down the group

The layers in graphite are held together by van der Waals forces

The greater the number of electrons in a molecule, the greater the van der Waals forces

H₂O has higher than expected b.p. because of intermolecular Van der Waals forces.

21. When the external pressure is 101.3 kPa torr, water will boil at what temperature?

14.5°C

18°C

100°C

12.8°C

22. A solute is most likely to be highly soluble in a solvent of the solute is ________ and the solvent is ________.

CH₄ is polar.

Of dipole-dipole interactions in CH₄.

Of hydrogen bonding in HF.

HF is more polarizable

23. Evaporation of water in shade is

Faster

Fast

None of these

Slow

24. Ice is _________ crystal

Metallic

Molecular

Ionic

Covalent

25. Which of the following equations represents the 2nd ionization energy of Na?

Na(g) → N²⁺ (g) + +¯

Na(s) → N²⁺ (g) + 2e¯

Na(g) → N²⁺ (g) + e¯

Na(s) → N²⁺ (g) + e¯

Page 2 of 2

26. Evaporation causes

Vapour pressure

High pressure

High temperature

Cooling

27. The boiling point increases down the zero group element due to

Hydrogen bonding

London forces

Dipole-dipole forces

Ion dipole forces

28. What do we see on the surface of the glass containing ice-chilled water?

Water vapour

Water droplets

Ice

Dust

29. How many joules of heat are absorbed when 70.0 grams of water is completely vaporized at its boiling point?

23,352

7,000

15,813

158,130

30. Rising of an wetting liquid in a capillary tube is due to

Viscosity

Cohesive forces

Adhesive forces

Surface tension

31. Molecular iodine would be most soluble in:

Carbon tetrachloride

Vinegar (acetic acid and water)

Alcohol

Water

32. Hydrogen bonding is involved in

Detergent

Solubility

All

Biological molecule

33. It is easy to wash clothes in hot water because its

Surface tension in less

Consumes less soap

Surface tension is more

None of these

34. g point of water is about 200°C higher than one would predict from the boiling points of hydrogen sulfide and hydrogen selenide. One may explain this apparent anomaly by which of the following?

Water is less polar than hydrogen sulfide and hydrogen selenide.

Water has the lowest molecular weight

The water molecule is lighter than the other two molecules.

The intermolecular attractive forces are much greater in water than in hydrogen sulfide and hydrogen selenide.

35. When water freezes at 0⁰C its density decreases due to

Cubic structure of ice

Empty space present in the structure of ice

Change of bond length

Change of bond angles

36. At room temperature, F₂, and Cl₂ are gases, Br₂ is a liquid, and I₂ is a solid. This is because:

Polarity increases with molecular size

Dipole-induced dipole interactions increase with molecular size

Dipole-dipole interactions increase with molecular size

Dispersion interactions increase with molecular size

37. The maximum hydrogen bonding is in

Water

Diethyl ether

Ethanol

Benzene

38. Vapour pressure of H₂O at 100C° is

55 mm of Hg

1489 mm Hg

760 mm of Hg

355 mm Hg

39. The boiling point of CH₄ is much lower than that of HF. This is because:

Of dipole-dipole interactions in CH₄.

CH₄ is polar

HF is more polarizable

Of hydrogen bonding in HF

40. NH₃ shows a maximum boiling point among the hydrides of V – A group elements due to

Very small size of nitrogen

Pyramidal structure of NH₃

Enhanced electronegative character of nitrogen

Ione pair of electrons present on nitrogen

41. Water has maximum density at

2⁰C

0⁰C

4⁰C

100⁰C

42. Molar heat of vaporization of water is

40.7 Kcal/mole

40.7 KJ/mole

40.7 J/mole

40.7 cal/mole

43. Water has high boiling point which is due to

High specific heat

High electric constant

H – bonding between its molecules

Weak dissociation

44. Van der Waal’s forces exist in

Covalent

Non-polar

Polar compounds

All types of atoms and molecules

45. Which one of the following exhibits intermolecular hydrogen bonding?

HCI

HBr

You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.

UET Peshawar Entry Test 2025 Registration Online ETEA Test D...
ECAT Statistics Test Set 17
ECAT Statistics Test Set 16
ECAT Statistics Test Set 15
ECAT Statistics Test Set 14
ECAT Statistics Test Set 13
ECAT Statistics Test Set 12
ECAT Statistics Test Set 11
ECAT Statistics Test Set 10
ECAT Statistics Test Set 9

Mustansar KhanLast Updated: April 19, 2025

Facebook Twitter Reddit WhatsApp Share via Email Print

ECAT Chemistry Liquids Test Online

Chemistry Liquids MCQS Online Test

ECAT Chemistry Liquids Chapter Online Test

ECAT Chemistry Liquids Test

Chemistry

You Might Also Like

Mustansar Khan

Leave a Reply Cancel reply