Post-UTME Chemistry 2014 Objective — Question 7
Question 7 of 10 from the Post-UTME Screening (Post-UTME) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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The addition of water to calcium oxide leads to
- A. a physical change
- B. a chemical changeCorrect
- C. the formation of a mixture
- D. an endothermic change
Explanation
CaO + H2O -> Ca(OH)2 is a chemical reaction (slaking of lime) producing a new substance, so it is a chemical change. (No printed answer key for this session; answer worked out independently.)
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