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Question
Chemistry
Which of the following ions will cause hardness in water sample?
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Q. Which of the following ions will cause hardness in water sample?
Hydrogen
A
$Ca^{2+}$
63%
B
$Na^{+}$
14%
C
$Cl^{-}$
15%
D
$K^{+}$
7%
Solution:
Presence of calcium and magnesium salts in the form of hydrogencarbonate, chloride and sulphate in water makes water ‘hard’.