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 7 of 18
- A. molecules become more disordered.
- B. K.E of the molecules decreases
- C. intermolecular forces become weaker.
- D. molecules move more frequently.
Explanation: During melting, the particles absorb heat, so their average kinetic energy increases rather than decreases.
Correct answer: K.E of the molecules decreases- A. 40%
- B. 50%
- C. 60%
- D. 70%
Explanation: Relative humidity is the ratio of the partial pressure of water vapor present in the air to the vapor pressure of water at a particular…
Correct answer: 60%- A. Methanol > Ethanol
- B. Methanol < Ethanol
- C. Methanol = Ethanol
- D. None of these
Explanation: The boiling point of alcohols increases as the size of the alcohol molecule increases.
Correct answer: Methanol < Ethanol- A. increases with increasing pressure
- B. decreases with increasing pressure
- C. is independent of pressure
- D. is proportional to pressure
Explanation: Ice, unlike most substances, contracts upon melting. When pressure is applied to ice, it forces the molecules closer together, making it…
Correct answer: decreases with increasing pressure- A. -2 °C
- B. -4 °C
- C. None of these
- D. 0 °C
Explanation: Freezing or melting point is defined as the temperature at which the liquid and solid states of a substance are in equilibrium with each…
Correct answer: 0 °C- A. Ice
- B. Liquid
- C. Vapour
- D. Both ice and liquid
Explanation: 0degree C at 1 atm pressure is the freezing point of pure water where its solid-state and liquid state coesxist in an equilibrium.
Correct answer: Both ice and liquid- A. Decrease in volume
- B. Decrease in density
- C. Increase in density
- D. Increase in volume
Explanation: Ice is less dense than water. Freezing causes a decrease in density because the water molecules form a more open and less dense structure…
Correct answer: Decrease in density- A. Dipole dipole forces.
- B. Debye forces.
- C. H-bonding.
- D. London dispersion forces.
Explanation: Hydrogen bonding is a type of intermolecular force that occurs between a hydrogen atom bonded to an electronegative atom (such as…
Correct answer: H-bonding.- A. Its structure is similar to diamond
- B. High density
- C. Low density
- D. None
Explanation: Normally, when a substance freezes, it becomes denser. This is because the molecules slow down and pack closer together.
Correct answer: Low density- A. 15
- B. 29
- C. 9
- D. 100
Explanation: The exact amount of volume that ice occupies more than water depends on the temperature and pressure.
Correct answer: 9131. Ice has_ structure.
- A. Tetrahedral
- B. Octahedral
- C. Cubic
- D. Hexagonal
Explanation: For Fedral Board: The water molecules in ice are arranged in a hexagonal lattice, with each molecule being bonded to four other molecules.
Correct answer: Hexagonal- A. Continuous
- B. Endothermic
- C. Exothermic
- D. Spontaneous
Explanation: The molecules are absorbing heat, evaporation is called endothermic. Remember, endo means "to enter" while thermic means "heat." So…
Correct answer: Exothermic- A. Temperature
- B. Intermolecular forces
- C. Density of liquid
- D. Surface area of liquid
Explanation: The surface area of liquid or solid in contact does not affect vapor pressure. Other factors do have an impact on vapor pressure.
Correct answer: Surface area of liquid- A. 120 oC
- B. 110 oC
- C. 100 oC
- D. 90 oC
Explanation: At a pressure of 1489 mmHg (millimeters of mercury), water will boil at approximately 120 degrees Celsius (212 degrees Fahrenheit).
Correct answer: 120 oC- A. Mercury pressure
- B. Glass pressure
- C. Atmospheric pressure
- D. Container pressure
Explanation: Option A) Mercury pressure and Option B) Glass pressure are incorrect because they do not have any direct relation to the measurement of…
Correct answer: Atmospheric pressure- A. Chloroform
- B. Methanol
- C. Water
- D. Ethanol
Explanation: The stronger the intermolecular forces, the lower the vapor pressure. Water has the strongest forces amongst these options (4 H-bonds)…
Correct answer: Water- A. Warmed
- B. Boiled
- C. Frozen
- D. Cooled
Explanation: The liquid is frozen with the help of a freezing mixture and the space above the liquid is evacuated.
Correct answer: Frozen- A. Remains constant
- B. Becomes zero
- C. Decreases
- D. Increases
Explanation: As the temperature of water reaches its boiling point, 100°C, liquid water begins to convert to water vapours.
Correct answer: Remains constant- A. 4.579 torr
- B. 23 torr
- C. 8.1 torr
- D. 17.54 torr
Explanation: The vapor pressure of water at 8 Celsius is a known value of 8.1 torr.
Correct answer: 8.1 torr- A. Melting point
- B. Boiling point
- C. Freezing point
- D. Cooling point
Explanation: Boiling point is the phenomenon in which one mole of a liquid is vaporized.The molar heat of vaporization, also known as the enthalpy of…
Correct answer: Boiling point