JAMB Chemistry 2025 Objective — Question 17
Question 17 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.
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The colour observed when CuSO₄·5H₂O is heated gently is due to
- A. Decomposition to CuO
- B. Removal of water of crystallisationCorrect
- C. Reduction of Cu²⁺
- D. Oxidation of SO₄²⁻
Explanation
CuSO₄·5H₂O (blue) loses its water of crystallisation on gentle heating to form white anhydrous CuSO₄. Adding water restores the blue colour.
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