JAMB Chemistry 2023 Objective — Question 3

Question 3 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2023 Objective paper, with the correct answer and a full explanation.

i. CaCO₃ ii. Ca(HCO₃)₂ iii. CaSO₄ — Which of the above causes temporary water hardness if present in water?

A. i only
B. ii onlyCorrect
C. iii only
D. i & ii

Explanation

Ca(HCO₃)₂ causes temporary hardness (removed by boiling). CaSO₄ causes permanent hardness. CaCO₃ is insoluble and does not cause hardness.

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