Question

A water is said to be hard if:

• A. it does not lather readily with soap.
• B. it does not contain minerals.
• C. it does not lather readily with detergents.
• D. it lathers readily with soap.

Answer 1

The correct option is A

it does not lather readily with soap.

Hard water does not lather readily with soap. The substances that cause hardness of water are bicarbonates, sulphates, and chlorides of calcium and magnesium.

Moreover, hard water reacts with soap molecules to form an insoluble white precipitate called as scum.