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JEE · NEET Previous Year Question

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

Topic: JEE PYQ

Answer: A. Full step-by-step solution below.

A $Ca^{2 +}$
B $Na^{+}$
C $Cl^{-}$
D $K^{+}$

Correct answer: A

Solution

(a) : The hardness of natural water is generally caused by presence of the bicarbonates chlorides and sulphates of calcium and magnesium.

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