JAMB Chemistry 2011 Objective — Question 13

Question 13 of 49 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Hardness of water is mainly due to presence of

A. A. calcium chloride or sodium chloride
B. B. calcium hydroxide or magnesium hydroxide
C. C. calcium trioxocarbonate (IV)Correct
D. D. sodium or magnesium hydroxide

Explanation

Ca(HCO3)2 and Mg(HCO3)2 are responsible for temporary hardness of water, while CaSO4 and MgSO4 are responsible for permanent hardness; calcium trioxocarbonate (IV), CaCO3, is the underlying compound mainly responsible for hardness.

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