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JAMB Chemistry 1992 Question 40

Question 40

Metals and their Compounds

CaO(s) + H2O(l) → Ca(OH)2(s) ΔH = −65 kJ. The process represented by the above equation is known as

  1. A.dissolution
  2. B.slaking
  3. C.liming
  4. D.mortaring.
Show the answer and explanation

Answer: B (slaking)

Explanation

Adding water to quicklime (CaO) to form slaked lime, Ca(OH)2, is called slaking; it gives out a lot of heat.