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 2 of 18
- A. Acetone
- B. Acetaldehyde
- C. Isopentane
- D. Benzene
Explanation: This is the option marked correct in the official UHS answer key. Isopentane is a branched non polar hydrocarbon whose only intermolecular…
Correct answer: Isopentane- A. 75%
- B. 81%
- C. 73%
- D. 89%
Explanation: The commonly cited composition for the human brain and heart is about 73% water, so option c matches the stated reference.
Correct answer: 73%- A. Change of bond angles
- B. Cubic structure of ice
- C. Empty space present in the structure of ice
- D. Change of bond length
Explanation: When water freezes, hydrogen bonds arrange its molecules into an open lattice containing empty spaces, so the same mass occupies a larger…
Correct answer: Empty space present in the structure of ice- A. Equal to that of ice
- B. Greater than that of ice
- C. Less than that of ice
- D. All are possible
Explanation: At the same ordinary pressure and near 0°C, liquid water is denser than ice because ice has an open hydrogen-bonded structure with greater…
Correct answer: Greater than that of ice- A. Extra heat is spread in the air
- B. High energy molecules continuously leaving the surface of liquid
- C. The forces of attractions become stronger
- D. The vapour pressure of the boiling liquid becomes greater than the external pressure
Explanation: At the boiling point, supplied heat is used as latent heat to overcome intermolecular attractions and convert liquid into vapour, not to…
Correct answer: High energy molecules continuously leaving the surface of liquid- A. 1/2sec
- B. 1/3rd
- C. 1/4th
- D. 1/5th
Explanation: A commonly quoted estimate is that about one-third of the solar energy absorbed at Earth's surface drives evaporation, which powers the…
Correct answer: 1/3rd- A. concentrated
- B. dilute
- C. saturated solution
- D. all of the above
Explanation: For a dilute solution of a non-volatile solute, the relative lowering of vapour pressure equals the mole fraction of solute and is…
Correct answer: dilute- A. boiling point elevation
- B. depression in freezing point
- C. lowering of vapour pressure
- D. lowering of osmotic pressure
Explanation: A Beckmann apparatus, particularly its sensitive Beckmann thermometer arrangement, is commonly used to measure the depression in freezing…
Correct answer: depression in freezing point29. The determination of correct molecular weight from Raoults law is applicable to_________________?
- A. a volatile solute in dilute solution
- B. a non-electrolyte & non volatile solute in concentrated solution
- C. a non-electrolyte & non volatile solute in concentrated solute
- D. non volatile solute in a dilute solution
Explanation: Raoult's law gives the relative lowering of vapour pressure for a dilute solution containing a non-volatile solute, and this relation is…
Correct answer: non volatile solute in a dilute solution- A. ideal solution
- B. zeotropic solution
- C. azeotropic solution
- D. non-ideal solution
Explanation: A zeotropic mixture changes composition during distillation because its vapour and liquid phases have different compositions.
Correct answer: zeotropic solution- A. will be an ideal solution
- B. will be non-ideal solution
- C. will show deviations from Raoults law
- D. both b & c
Explanation: If the volume of a solution equals the sum of the component volumes, the volume change on mixing is zero, which is a property of an ideal…
Correct answer: will be an ideal solution- A. zeotropic mixture
- B. azeotropic mixture
- C. amphoteric mixture
- D. ideal solution
Explanation: An azeotropic mixture boils and distils at a constant composition because its vapour has the same composition as the liquid.
Correct answer: azeotropic mixture- A. equal to the mole fraction of solvent
- B. equal to the mole fraction of solute
- C. directly proportional to the mole fraction of solute
- D. both B & C
Explanation: For a solution containing a non-volatile solute, Raoult's law gives (P° − P) / P° = Xsolute, so relative lowering of vapour pressure…
Correct answer: both B & C- A. Boiling point of water decrease
- B. Boiling point of water increase
- C. Boiling point of water remains same
- D. None of the above
Explanation: Dissolved salt lowers the vapour pressure of water, so a higher temperature is needed for the solution's vapour pressure to equal…
Correct answer: Boiling point of water increase- A. Surface tension
- B. Aqueous tension
- C. Vapour pressure
- D. Hydraulic pressure
Explanation: The pressure exerted by water vapour is its vapour pressure; when measured in the presence of another gas, it is also commonly called…
Correct answer: Aqueous tension- A. Melting
- B. Sublimation
- C. Decomposition
- D. Condensation
Explanation: A substance with very high vapour pressure can pass directly from solid to vapour when heated, provided its vapour pressure exceeds the…
Correct answer: Sublimation- A. Molar heat of sublimation
- B. Molar heat of fusion
- C. Molar heat of vapourization
- D. Latent heat of that liquid
Explanation: The heat required to convert one mole of liquid into gas at its boiling point is the molar heat, or molar enthalpy, of vaporization.
Correct answer: Molar heat of vapourization- A. 40.7 KJ/mole
- B. 40.7 J/mole
- C. 40.7 cal/mole
- D. 40.7 Kcal/mole
Explanation: The molar heat of vaporization of water is the heat required to convert 1 mole of liquid water into vapour at its boiling point, and its…
Correct answer: 40.7 KJ/mole- A. Ion dipole forces
- B. London forces
- C. Hydrogen bonding
- D. Dipole dipole forces
Explanation: The boiling points of noble gases increase down Group 18 because larger atoms have more electrons and stronger London dispersion forces.
Correct answer: London forces- A. crystallization
- B. evaporization
- C. vaporization
- D. condensation
Explanation: Condensation is the change of a vapour into a liquid, usually when the vapour loses heat.
Correct answer: condensation