Boiling needs _.
Correct answer: B. Supply of heat constantly
- A. Supply of heat in the start
- B. Supply of heat constantly
- C. Supply of heat at the end
- D. Supply of heat variably
Explanation
Boiling needs a continuous and constant heat supply. As a liquid is heated, the kinetic energy of its molecules increases, and hence the temperature also increases. At the boiling point, the kinetic energy of the molecules becomes maximum and any further heating at this stage will not increase the temperature. If the heat supply cuts before the boiling point is reached, the kinetic energy of the liquid molecules starts to decrease.
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?