JAMB Chemistry 2017 Objective — Question 16

Question 16 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2017 Objective paper, with the correct answer and a full explanation.

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

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

Explanation

Rainwater containing dissolved CO2 reacts with CaCO3 (or MgCO3) rock deposits to form soluble calcium bicarbonate, causing temporary hardness.

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