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JAMB Chemistry 2020 Objective — Question 24

Question 24 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

The metallic ions associated with water hardness are

A. Cu2+ and Zn2+
B. Ca2+ and Mg2+Correct
C. Mg2+ and Cu2+
D. K+ and Na+

Explanation

Water hardness is caused by dissolved Ca2+ and Mg2+ ions.

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