JAMB Chemistry 2019 Objective — Question 18
Question 18 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Which of the following pairs of substances are hygroscopic?
- A. CaCl₂ and NaOH
- B. CaCl₂ and CuO
- C. MgCl₂ and CaO
- D. CuO and CaOCorrect
Explanation
CaCl₂, MgCl₂ and NaOH are deliquescent (they absorb enough moisture to dissolve into a solution), while CaO and CuO are hygroscopic (they absorb moisture without dissolving).
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