JAMB Chemistry 2025 Objective — Question 21
Question 21 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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Which method softens temporary but not permanent hard water?
- A. BoilingCorrect
- B. Zeolite ion-exchange
- C. Distillation
- D. Adding washing soda
Explanation
Boiling removes temporary hardness (Ca(HCO₃)₂ → CaCO₃ + H₂O + CO₂) but not permanent hardness. Ion exchange and distillation remove both types.
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