Free Liquids MCQs with Answers
350 Liquids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Liquid properties arise from intermolecular attractions, including surface tension, viscosity, cohesion and adhesion. The topic links evaporation, vapour pressure and boiling point with temperature, explains hydrogen bonding, and covers water's unusual expansion on freezing and its density maximum, which distinguish water from ordinary liquids.
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350 questions · page 3 of 18
- A. Latent heat of fusion
- B. Latent heat of vaporization
- C. Latent heat of sublimation
- D. All of the above
Explanation: Steam contains the latent heat of vaporization absorbed when liquid water changed into vapour, in addition to its sensible heat; releasing…
Correct answer: Latent heat of vaporization- A. Surface phenomenon
- B. Continuous
- C. Exothermic
- D. Cause cooling
Explanation: Evaporation is a surface phenomenon that occurs continuously below the boiling point and causes cooling because higher-energy molecules…
Correct answer: Exothermic- A. increase
- B. remains constant
- C. decrease
- D. there will be no boiling
Explanation: At the boiling point, the liquid vapour pressure equals the external pressure, and additional heat is used to overcome intermolecular…
Correct answer: remains constant- A. Diethyl ether
- B. Ethyl alcohol
- C. Water
- D. Ethylene glycol
Explanation: Diethyl ether has weaker intermolecular attractions and a lower boiling point than ethanol, water, and ethylene glycol, so it escapes into…
Correct answer: Diethyl ether- A. Surface area
- B. temperature
- C. intermolecular forces
- D. atmospheric pressure
Explanation: For a liquid at a fixed temperature, vapour pressure depends mainly on the escaping tendency of its molecules, which is affected by…
Correct answer: Surface area- A. vapourization
- B. evaporation
- C. condensation
- D. cracking
Explanation: Evaporation is the escape of molecules from the surface of a liquid into the vapour phase, and it can occur below the boiling point.
Correct answer: evaporation- A. vaporization
- B. evaporation
- C. crystallization
- D. sublimation
Explanation: The molar heat of vaporization is the heat needed to convert 1 mole of liquid into vapour at its boiling point without changing…
Correct answer: vaporization- A. 55 mm Hg
- B. 760 mm Hg
- C. 355 mm Hg
- D. 1489 mm Hg
Explanation: At 100°C, water boils at normal atmospheric pressure because its vapour pressure equals 1 atmosphere, which is 760 mm Hg.
Correct answer: 760 mm Hg- A. Between 760 torr and 1200 torr
- B. Between 200 torr and 760 torr
- C. 765 torr
- D. any value of pressure
Explanation: Water boils when its vapour pressure equals the external pressure. Since water's vapour pressure at 110°C is greater than 760 torr and is…
Correct answer: Between 760 torr and 1200 torr- A. 8
- B. 5.1
- C. 6
- D. one/fifty one
Explanation: For a dilute solution of a non-volatile solute, relative lowering of vapour pressure equals the solute mole fraction.
Correct answer: one/fifty one- A. Ammonia gas
- B. Ice
- C. Ethanol
- D. Acetone and chloroform
Explanation: Ice has an extensive, three-dimensional hydrogen-bonded network, with each water molecule strongly interacting with neighbouring…
Correct answer: Ice- A. Water
- B. Ethyl Alcohol
- C. Phenol
- D. All of these
Explanation: Water, ethyl alcohol, and phenol all contain an O-H bond, allowing hydrogen bonding between the partially positive hydrogen and a lone…
Correct answer: All of these- A. Ionic
- B. Covalent
- C. Hydrogen
- D. Dating
Explanation: The hydrogen and oxygen atoms within one water molecule share electrons, forming polar covalent O-H bonds.
Correct answer: Covalent- A. 2
- B. 3
- C. 4
- D. None
Explanation: One water molecule can donate two hydrogen bonds through its two hydrogen atoms and accept two through the two lone pairs on oxygen…
Correct answer: 4- A. Due to Hydrogen bonding
- B. Due to high molecular weight
- C. Due to its Acidic nature
- D. Due to its Low molecular weight
Explanation: Ethanol molecules form hydrogen bonds through the O-H group, so more energy is needed to separate them into vapour than in acetone, whose…
Correct answer: Due to Hydrogen bonding- A. C2H6
- B. C2H5Cl
- C. CH3OCH3
- D. C2H5OH
Explanation: Ethanol, C2H5OH, forms hydrogen bonds because its O-H group contains hydrogen bonded to highly electronegative oxygen, and oxygen has lone…
Correct answer: C2H5OH- A. Coordinate covalent bonds
- B. Hydrogen bonds
- C. Debye forces
- D. London dispersion forces
Explanation: Coordinate covalent bonds are intramolecular bonds formed when one atom supplies both electrons in a shared pair, so they are not…
Correct answer: Coordinate covalent bonds- A. Water
- B. Ethyl alcohol
- C. Phenol
- D. Diethyl ether
Explanation: Hydrogen bonding requires hydrogen bonded to a highly electronegative atom such as O, N or F, and a lone pair on a neighbouring molecule.
Correct answer: Diethyl ether- A. Solubility
- B. Cleansing action of detergents
- C. Biological molecules
- D. All
Explanation: Hydrogen bonding helps polar substances dissolve in water, contributes to interactions in biological molecules, and assists detergent…
Correct answer: All- A. Efflorescence
- B. Dehydrogenation
- C. Desalination
- D. Deliquescence
Explanation: Deliquescent substances absorb water vapour from the atmosphere and may dissolve in the absorbed water.
Correct answer: Deliquescence