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JAMB Chemistry 2012 Question 13

Question 13

Air

I. It has a varied composition from one place to another. II. Its constituents can be separated by physical means III. It contains unreactive noble gases.
Which of the above shows that air is a mixture?

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

Answer: A (I and II only)

Explanation

A mixture has no fixed composition and can be separated physically. Containing noble gases says nothing about whether air is a mixture.