Water is said to be hard when ?

It does not lather readily with soap.

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It does not contain minerals.

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It contains minerals.

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It lathers readily with soap.

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Solution

The correct option is A It does not lather readily with soap.
Hard water is defined as the water which does not lather readily with ordinary soap. The substances that cause hardness of water are bicarbonates, sulphates, and chlorides of calcium and magnesium.

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Soap does not form lather with hard water:-

A water sample contains magnesium bicarbonates. It does not lather with soap. How can we make the water sample useful for cleaning clothes?

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