Chemistry > 2011 > 14
JAMB UTME
Hardness of water is mainly due to the presence of
A.
calcium hydroxide or magnesium hydroxide
B.
calcium trioxocarbonate (IV) or calcium tetraoxosulphate (VI)
C.
sodium hydroxide or magnesium hydroxide
D.
calcium chloride or sodium chloride salts
Answer: B
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