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JAMB Chemistry 1995 Question 7

Question 7

Kinetic Theory and States of Matter

A liquid begins to boil when

  1. A.its vapour pressure is equal to the vapour pressure of its solid at the given temperature
  2. B.molecules start escaping from its surface
  3. C.its vapour pressure equals the atmospheric pressure
  4. D.its volume is slightly increased
Show the answer and explanation

Answer: C (its vapour pressure equals the atmospheric pressure)

Explanation

Boiling starts when the vapour pressure of the liquid becomes equal to the pressure of the air above it. Bubbles of vapour can then form throughout the liquid.