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JAMB Chemistry 1993 Question 17

Question 17

Water

The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as

  1. A.deliquescence
  2. B.hygroscopy
  3. C.effervescence
  4. D.efflorescence
Show the answer and explanation

Answer: D (efflorescence)

Explanation

Efflorescence is when a hydrated crystal gives off some of its water of crystallization to the air and becomes powdery, as washing soda (Na2CO3·10H2O) does.