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प्रश्न
Compare the effect of soaps and detergents on hard water.
उत्तर
Water that contains and ions is called hard water. When soap is added to hard water, insoluble compounds form which appears as sticky scum. This scum leaves a deposit on clothes, skin, and hair. You could have a ring around the collar. Detergents have replaced soap for many cleaning jobs around the home.
The development of synthetic detergents by chemists was a great advantage for people with relatively hard tap water in their homes.
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| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
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