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Question

Hardness of water is due to presence of salts of 


A
Na and K
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B
Ca and Mg
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C
Ca and K
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D
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 $$ Ca^{2+} $$ and $$ Mg^{2+} $$ 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.

Chemistry

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