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JAMB Chemistry 1989 Question 1

Question 1

Separation of Mixtures

Which of the following would support the conclusion that a solid sample is a mixture?

  1. A.The solid can be ground to a fine powder.
  2. B.The density of the solid is 2.25 g dm3.
  3. C.The solid has a melting range of 300°C to 375°C.
  4. D.The solid absorbs moisture from the atmosphere
Show the answer and explanation

Answer: C (The solid has a melting range of 300°C to 375°C.)

Explanation

A pure substance melts sharply at one temperature. Melting over a wide range (300–375 °C) shows the solid is a mixture.