Most Important Liquids Quiz Test Online

Liquids Quiz Test Online

Liquids Test. 1

1 / 20

The dominant Van der Waals force in NH₃ is:

Dipole-dipole forces

Dipole-induced dipole forces

London dispersion forces

Hydrogen bonding

2 / 20

The boiling point of water would be highest at:

Gwadar

Siachin

Murree

Mount Everest

3 / 20

Which of the following is the correct order of increasing intermolecular interactions?

Hydrogen bonding, London forces, Dipole-dipole

London forces, Hydrogen bonding, Dipole-dipole

London forces, Dipole-dipole, Hydrogen bonding

Dipole-dipole, London forces, Hydrogen bonding

4 / 20

What type of force exists between ions and water molecules?

Dipole-induced dipole forces

Dipole-dipole forces

London dispersion forces

Ion-dipole forces

5 / 20

The attractive forces between the partial positive end of one molecule and the partial negative end of another molecule are called:

London dispersion forces

Dipole-dipole forces

Ion-dipole forces

Debye forces

6 / 20

Why is propanone (acetone) miscible in water?

Dipole-dipole attraction exists between them

All of these

Both are polar molecules

Hydrogen bonding occurs between them

7 / 20

Which of the following is false for evaporation?

continuous

causes cooling

surface phenomenon

exothermic

8 / 20

Which of the following has the highest boiling point?

CHCl₃

NH₃

Br₂

9 / 20

Which of the following has the strongest intermolecular forces?

Iodine (I₂)

Chlorine (Cl₂)

Hydrogen (H₂)

Methane (CH₄)

10 / 20

10)

Vapour pressure of water at 0°C is 4.579 torr, and at 10°C it is 9.209 torr, so increase in vapour pressure from 0 C to 10 C is 4.630 torr What will be the change in vapour pressure from 90°C to 100°C?

> 4.630 torr

v.p remains same at all temperatures

4.630 torr

< 4.630 torr

11 / 20

11)

Which of the following has highest volatility?

Ethyl alcohol

Water

Ethylene glycol

Diethyl ether

12 / 20

12)

The vapour pressure of water at 100°C is:

760 mm Hg

55 mm Hg

1489 mm Hg

355 mm Hg

13 / 20

13)

Liquids have no definite shape because:

The intermolecular forces in liquids are weaker than in solids

All statements are correct

Liquid molecules have kinetic energy less than gases

The molecules of liquid are in constant motion, sliding over each other

14 / 20

14)

The conversion of vapours back to liquid is called:

Condensation

Evaporation

Vapourization

Crystallization

15 / 20

15) Nature of bonding affects the properties like:

All of these

Reaction kinetics

Solubility

Melting, boiling points and isomerism

16 / 20

16)

Why does CHCl₃ (Chloroform) exist in a liquid state?

Hydrogen bonding

Dipole-induced dipole forces

Dipole-dipole and London dispersion forces

dipole-dipole forces

17 / 20

17)

Which forces are present between all types of atoms and molecules?

Hydrogen bonding

Dipole-induced dipole forces

Dipole-dipole forces

London dispersion forces

18 / 20

18)

Strong dipole-dipole forces among liquid molecules are responsible for:

All are correct

Very low boiling point

Very high heat of vaporization

Very low heat of vaporization

19 / 20

19)

Which of the following has the highest vapour pressure?

Mercury

Isopentane

Glycerol

Water

20 / 20

20)

Why do liquids take the shape of their container?

Liquid molecules can slide over each other

Liquids are highly compressible

Liquids do not have a definite shape

Liquids do not have a definite volume

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Liquids Test. 2

1 / 20

1) The rate of evaporation of a liquid does not depend on:

Temperature

All of these

Intermolecular forces

Surface area of the liquid

2 / 20

2) At 1 atm pressure, liquid 1 has a boiling point lower than liquid 2. What can we predict about both liquids?

Liquid 1 has a higher vapour pressure than liquid 2

All of the above

Liquid 1 has weaker intermolecular forces of attraction than liquid 2

Liquid 1 is more volatile than liquid 2

3 / 20

3) A pressure cooker reduces cooking time because:

The boiling point of water rises

Heat is uniformly distributed

A large flame is used

Vapour pressure of the liquid decreases

4 / 20

To maintain the boiling point of water at 110°C, the pressure should be:

Between 760 torr and 1200 torr

Between 200 torr and 760 torr

Any pressure value

765 torr

5 / 20

5) The distillation of a solution under reduced pressure is called:

Fractional distillation

Vacuum distillation

Distillation

Destructive distillation

6 / 20

6) When ammonia is dissolved in water, the number of hydrogen bonds formed by ammonia is:

7 / 20

7) Lower alcohols are soluble in water because:

Low electronegativity difference between C and H

Intermolecular hydrogen bonding

All of the above

Dipole-induced dipole forces

8 / 20

8) The strongest hydrogen bond is:

N—H

O—H

O—F

F—H

9 / 20

9) Molar heat of vaporization of water is:

14.6 kJ mol⁻¹

40.6 kJ mol⁻¹

140.6 kJ mol⁻¹

Zero

10 / 20

10) Hydrogen bonding is involved in:

Biological molecules

Solubility

Cleansing action of detergents

All of the above

11 / 20

11) The strength of hydrogen bonding is:

20 times less than a covalent bond

20 times more than an ionic bond

20 times less than an ionic bond

20 times more than a covalent bond

12 / 20

12) Evaporation is designated as a cooling process because of the reason

High energy molecules leave behind the low energy molecules and cause cooling

It is exothermic process

All of the above

It is a surface phenomenon

13 / 20

13) Which one of the following would cause severe burning?

Water at 20°C

Steam at 100°C

Boiling water at 90°C

Boiling water at 80°C

14 / 20

14) Which of the following can form hydrogen bonding among its molecules more prominently?

CH₃COOH

CHCl₃

CH₃OH

All of these

15 / 20

15) The boiling point of a liquid is the temperature at which:

The vapour pressure of the liquid is equal to the intermolecular forces of the liquid molecules

The vapour pressure of the liquid is greater than the atmospheric pressure

The vapour pressure of the liquid is less than the atmospheric pressure

The vapour pressure of the liquid is equal to the atmospheric pressure

16 / 20

16) When two ice cubes are pressed against each other, they stick due to:

Metallic bond formation

Hydrogen bond formation

Covalent attraction

Ionic bond formation

17 / 20

17) The correct order of boiling points of the given liquids is: (MDCAT 2012)

H₂O > HF > HCl > NH₃

H₂O > HF > NH₃ > HCl

HF > H₂O > NH₃ > HCl

HF > H₂O > HCl > NH₃

18 / 20

18) When water freezes at 0°C, its density decreases due to:

Change in bond angles

Cubic structure of ice

Empty space present in the structure of ice

Change in bond length

19 / 20

19) Vapour pressure of a liquid depends on:

Volume of the liquid

Surface area and temperature only

Temperature and intermolecular forces

Humidity of the liquid in the air

20 / 20

20) If we provide very high amount of heat to a liquid its boiling point will

Decrease

There will be no boiling

Remains constant

Increase

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Liquids Test. 3

1 / 21

1) Steam causes severe burns compared to boiling water because: (ETEA 2019)

Absence of hydrogen bonding

Freely moving molecules

High latent heat of vaporization

Statement is incorrect

2 / 21

2) SO₂ and CO₂ are both tri-atomic molecules, but the heat of vaporization of SO₂ is greater due to: (MDCAT 2020)

Greater size of SO₂

SO₂ is an ionic molecule

SO₂ is polar, and CO₂ is non-polar

High electronegativity of S

3 / 21

3) The DNA molecule is double-stranded, in which two chains of DNA are twisted around each other by: (MDCAT 2011)

Hydrogen bonds

Dative bonds

Van der Waals forces

Covalent bonds

4 / 21

4) Which of the following substances exhibits hydrogen bonding? (MDCAT 2019)

NH₃

SiH₄

H₂S

5 / 21

5) What is the reason that ice at 0°C occupies more volume than water?

Debye forces

Empty spaces in the structure

Intermolecular forces

Ionic bonds

6 / 21

6) In the crystal lattice of ice, each oxygen atom of a water molecule is attached to: (MDCAT 2014)

Two hydrogen atoms

Four hydrogen atoms

Three hydrogen atoms

One hydrogen atom

7 / 21

7) Which of the following substances exhibits hydrogen bonding? (MDCAT 2017)

NH₃

SiH₄

H₂S

8 / 21

8) According to Watson and Crick’s model, the double helix structure of DNA is held together by: (MDCAT 2019)

Hydrogen bonding

van der Waals forces

Ionic bonding

Dipole-induced dipole forces

9 / 21

9) An intermolecular force of attraction X is relatively stronger than the other intermolecular forces, it stabilizes the α-helix and β-pleated sheet structures of proteins. The double helical structure of DNA is also stabilized by this force of attraction. Identify X. (MDCAT 2019)

Hydrogen bonding

Ionic interactions

Dipole-dipole attraction

van der Waals forces

10 / 21

10) In an H-F bond, the electronegativity difference is 2.0. What is the type of this bond? (MDCAT 2019)

Non-polar covalent bond

π (pi) bond

Polar covalent bond

Co-ordinate covalent bond

11 / 21

11) At 1489 mmHg, water will boil at: (NUMS 2019)

120°C

110°C

100°C

90°C

12 / 21

12) Conduction in metals involves the relatively free movement of: (MDCAT 2017)

Ions

Atoms

Electrons

Molecules

13 / 21

13) Which of the following is not a molecular solid? (MDCAT 2020)

Bromine

Sulphur

Phosphorus

Carbon dioxide

14 / 21

14) Water has maximum density at: (NUMS 2019)

1°C

4°C

0°C

-4°C

15 / 21

15) Which hydrogen bond is stronger than others? (MDCAT 2015)

N—H⋯O—H

O—H⋯O—H

F—H⋯F—H

N—H⋯N—H

16 / 21

16) The boiling point of water is higher than petrol because intermolecular forces in water are: (MDCAT 2011)

Negligible

Weaker than petrol

The same as in petrol

Stronger than petrol

17 / 21

17) Which of the following has the lowest vapor pressure at 20C? (MDCAT 2021)

Diethyl ether

Chlorofoam

Water

Carbon tetrachloride

18 / 21

18) At higher altitudes, the boiling point of water is less than 100°C due to: (ETEA 2019)

Higher atmospheric pressure

Lower atmospheric pressure

No change in atmospheric pressure

Weak hydrogen bonding

19 / 21

19) Ice is less dense than water at: (MDCAT 2014)

4°C

0°C

-4°C

2°C

20 / 21

20) The helical structure of DNA is also stabilized by: (MDCAT 2019)

van der Waals forces

Ionic interactions

Hydrogen bonding

Dipole-dipole attraction

21 / 21

21) Which type of force is present in gasoline? (MDCAT 2015)

Hydrogen bonding

Dipole-dipole forces

Dipole-induced dipole forces

London dispersion forces

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Most Important Liquids Quiz Test Online

Liquids Quiz Test Online

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