Hardness of water is due to presence of salts ofA. `Na^(+)` and `K^(+)`B. `Ca^(2+)`and `Mg^(2+)`C. `Ca^(2+)` and `K^(+)`D. `Ca^(2+)` and `Na^(+)`

Hardness of water is due to presence of salts ofA. `Na^(+)` and `K^(+)

1.	Hardness of water is due to presence of salts ofA. `Na^(+)` and `K^(+)`B. `Ca^(2+)`and `Mg^(2+)`C. `Ca^(2+)` and `K^(+)`D. `Ca^(2+)` and `Na^(+)`
Answer» Correct Answer - b Hardness of water 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 form curdy white precipitates. As a result, hard water does not produce lather with soap immediately.

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Hardness of water is due to presence of salts ofA. `Na^(+)` and `K^(+)`B. `Ca^(2+)`and `Mg^(2+)`C. `Ca^(2+)` and `K^(+)`D. `Ca^(2+)` and `Na^(+)`

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