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JAMB Chemistry 1979 Question 33

Question 33

Water

Weighed salts Y and Z were left exposed in the laboratory overnight. In the morning Y had gained weight, and Z had become liquid. What conclusion could be drawn about the nature of the two salts?

  1. A.Z is efflorescent
  2. B.Y and Z are efflorescent
  3. C.Y and Z are deliquescent
  4. D.Y and Z are hygroscopic
  5. E.Y is deliquescent.
Show the answer and explanation

Answer: D (Y and Z are hygroscopic)

Explanation

Both salts absorbed water from the air, so both are hygroscopic. Z absorbed so much that it dissolved (deliquescent), but Y only gained weight, so we cannot say Y is deliquescent.