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JAMB Chemistry 1994 Question 2

Question 2

Separation of Mixtures

A pure solid usually melts

  1. A.over a wide range of temperature
  2. B.over a narrow range of temperature
  3. C.at a lower temperature than the impure one
  4. D.at the same temperature as the impure one
Show the answer and explanation

Answer: B (over a narrow range of temperature)

Explanation

A pure solid has a sharp melting point, melting over a very narrow temperature range. Impurities lower the melting point and spread it over a wider range.