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JAMB Chemistry 2013 Question 14

Question 14

Water

An example of a hygroscopic substance is

  1. A.CuO(s)
  2. B.MgCl2(s)
  3. C.CaCl2(s)
  4. D.NaOH(s)
Show the answer and explanation

Answer: A (CuO(s))

Explanation

Copper(II) oxide absorbs moisture from the air without dissolving in it (hygroscopic); MgCl2, CaCl2 and NaOH absorb enough to dissolve (deliquescent).