WAEC Chemistry 2019 Objective — Question 24
Question 24 of 50 from the West African Examinations Council (WAEC) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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When quick lime dissolves in water,
- A. heat is absorbed
- B. heat is evolvedCorrect
- C. oxygen is liberated
- D. hydrogen is given off
Explanation
The reaction of quicklime (CaO) with water to form slaked lime, Ca(OH)2, is exothermic, so heat is evolved.
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