Hardness of water is due to presence of salts of

Na and K

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Ca and Mg

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Ca and K

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Ca and Na

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Solution

The correct option is B Ca and Mg
Hardness of water is due to the presence of bicarbonates, chlorides and sulphates of Ca and Mg on it. These $C a^{2 +}$ and $M g^{2 +}$ ions react with the anions of fatty acids present in soaps to from curdy white precipitates. As a result, hard water does not produce lather with soap immediately.

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