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Which one of the following statements is correct?

Options

  1. ABoth boiling and evaporation are surface phenomen.
  2. BBoiling is a surface phenomenon, but evaporation is a bulk phenomenon.
  3. CBoth boiling and evaporation are bulk phenomena.
  4. DBoiling is a bulk phenomenon, but evaporation is a surface phenomenon.

Correct answer

D. Boiling is a bulk phenomenon, but evaporation is a surface phenomenon.

Step-by-step solution

Boiling is a bulk phenomenon. Therefore the heat energy goes to the entire bulk of liquid and starts boiling. Whereas evaporation is a surface phenomenon. Only the particles on the surface gain enough energy to get converted into vapour state.

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