Hard water contains dissolved
Asodium and potassium salts
Bcalcium and magnesium saltsCORRECT
Ciron and copper salts
Dcarbon and nitrogen
JAMB UTMEChemistry
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Why the answer is B, and why the others tempt you.
Hardness is caused mainly by dissolved Ca²⁺ and Mg²⁺ ions (as carbonates, sulfates, or chlorides).
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