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

(i) Ca2+

(ii) Na+

(iii) Cl

(iv) K+

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(i) Ca++ ions in the form of Ca(HCO3)2 or CaCl2 or CaSO4 cause hardness in water,i.e.,soluble salts of calcium can cause hardness in water.  

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