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JAMB Chemistry 1982 Question 40

Question 40

Water

Sodium carbonate crystals on exposure to a dry atmosphere change to a white powder. This phenomenon is known as

  1. A.deliquescence
  2. B.hygroscopy
  3. C.oxidation
  4. D.efflorescence
  5. E.sublimation
Show the answer and explanation

Answer: D (efflorescence)

Explanation

Losing water of crystallization to the air and crumbling to a powder is called efflorescence.