Free Evaporation, Boiling Point and Vapour Pressure MCQs with Answers
107 Evaporation, Boiling Point and Vapour Pressure MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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107 questions · page 6 of 6
- A. amount of liquid
- B. size of molecule
- C. temperature of liquid
- D. intermolecular forces
Explanation: The amount of liquid does not affect the magnitude of vapor pressure. Vapor pressure is primarily determined by the temperature of the…
Correct answer: amount of liquid- A. 200-760 torr
- B. 760-1200 torr
- C. 665-670 torr
- D. 660-700 torr
Explanation: To boil water at 110 °C, the external pressure should be approximately 1.4 atm, which is equivalent to 1,064 torr.
Correct answer: 760-1200 torr- A. Surface tension is greater than the atmospheric pressure
- B. Viscosity is less than the atmospheric pressure
- C. Vapor pressure equals the atmospheric pressure
- D. Viscosity equals the atmospheric pressure
Explanation: The temperature at which vapor pressure becomes equal to atmospheric pressure is called the boiling point.
Correct answer: Vapor pressure equals the atmospheric pressure- A. Water
- B. Kerosene oil
- C. Mercury
- D. rectified spirit
Explanation: Vapor pressure is determined by the strength of intermolecular forces, with weaker forces leading to higher vapor pressure.
Correct answer: Mercury- A. Barometric method is more accurate than Manometric method.
- B. Manometric method is more accurate than Barometric method.
- C. Both are equally accurate and applicable.
- D. Both methods are in use but are not reliable.
Explanation: Barometers are more limited in design and function than manometers, hence, manometers can calculate other pressures along with atmospheric…
Correct answer: Manometric method is more accurate than Barometric method.- A. Absence of hydrogen bonding
- B. High latent heat of vaporization
- C. Freely moving molecules
- D. Statement is incorrect
Explanation: Steam has more warmth and vitality than water. Due to its dormant warmth of vaporization, it will produce more burn than boiling water.
Correct answer: High latent heat of vaporization- A. Carbon tetrachloride
- B. Ethyl alcohol
- C. Benzene
- D. Acetic acid
Explanation: Option A (Carbon tetrachloride) is correct. It has the lowest boiling point because it is a nonpolar molecule with weak intermolecular…
Correct answer: Carbon tetrachloride