Hardness of water due to presence of salts of

Options

(a) Na⁺ and K⁺
(b) Ca²⁺ and Mg²⁺
(c) Ca²⁺ and K⁺
(d) Ca²⁺ and Na⁺

Correct Answer:

Ca²⁺ and Mg²⁺

Explanation:

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