Minimum vapour pressure is of:
Correct answer: B. Br2
- A. CH4
- B. Br2
- C. Xe
- D. All same
Explanation
Vapour pressure is the pressure exerted by a vapour in equilibrium with its solid or liquid form at a given temperature. Br2has Dipole-Dipole Forces and London Dispersian Forces while CH4 and Xe both have London Dispersian Forces which is weaker than Dipole-Dipole Forces.Br2 has the highest boiling point of the three substances, which means that it has the strongest intermolecular forces and the lowest vapor pressure.Br2 has a boiling point of 58.8°C.
Last updated
About Evaporation, Boiling Point and Vapour Pressure
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.
Practise Liquids
350 free Liquids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
18g glucose is dissolved in 90g water the relative lowering in vapour pressure is equal to ___________________?
A jar contains a gas and a few drops of water at 'T' Kelvin temperature. The pressure in the jar is 830 mm of Hg. The temperature of the jar is reduced by 1%. The vapour pressure of water at two temperatures are 30 and 25 mm of Hg respectively. Calculate the new pressure in the jar?
A liquid boils when its vapour pressure becomes equal to
A pressure cooker cooks food faster because increasing the pressure inside
A pressure cooker works on which principle?