JAMB Chemistry 2018 Objective — Question 25

Question 25 of 36 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2018 Objective paper, with the correct answer and a full explanation.

Temporary hardness of water is formed when rain water containing dissolved carbon (IV) oxide flows over deposit of

A. CaCO₃Correct
B. Na₂CO₃
C. Na₂SO₄
D. CaSO₄

Explanation

Rainwater containing dissolved CO₂ reacts with calcium (IV) oxide/carbonate (CaCO₃) deposits to form soluble calcium hydrogen carbonate, causing temporary hardness.

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