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JAMB Physics 2007 Question 35

Question 35

Change of State and Vapours

I. Increase the melting point of the liquid.
II. Increase the boiling point of the liquid.
III. Decrease the melting point of the liquid.
IV. Decrease the boiling point of the liquid.
Which of the statements above about the effects of increase in pressure in a liquid are correct?

  1. A.II and III only
  2. B.I and II only
  3. C.III and IV only
  4. D.I and III only
Show the answer and explanation

Answer: A (II and III only)

Explanation

Higher pressure makes a liquid boil at a higher temperature (pressure cooker). For water, higher pressure lowers the melting point (regelation). So II and III are correct.