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Which of the following ions will cause hardness in the water sample?
(i) Ca^{2+}
(ii) Na^{+}
(iii) Cl^{-}
(iv) K^{+}

Answers (1)

The answer is the option (i) Ca^{2+}

These ions often in the common forms of Ca (HCO_3) or CaCl_2 will have an effect on the water by making it harsh and hard as the salts of calcium are soluble in water making it hard.

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