Which of the following ions causes the hardness of water?

Sodium

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Potassium

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Calcium

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Chloride

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Solution

The correct option is C Calcium
Calcium along with magnesium causes the hardness of water.

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Question 15

Which of the following ions will cause hardness in water sample?

(a) $C a^{2 +}$ (b) $N a^{+}$ (c) $C l^{-}$ (d) $K^{+}$

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