Water is said to be soft when

It doesn't form lather with soap

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It easily forms lather with soap

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When it contains lots of salts and impurities.

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when it feels soft.

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Solution

The correct option is B
It easily forms lather with soap

Pure water or water containing sodium salts is called soft water as it forms lather easily with soap and is suitable for use.

Hard water, on the other hand, doesn't form lather and contains impurities like Hydrogen carbonate, sulphates or chlorides of calcium and magnesium.

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Similar questions

Hard water gives lather with soap easily.

Soap does not form lather with hard water:-

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