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| Q. |
Detergents clean surfaces on the principle of – |
| A. | viscosity |
| B. | surface tension |
| C. | elasticity |
| D. | floatation |
| Answer» B. surface tension | |
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Explanation: Detergents and soaps are used for cleaning because pure water can't remove oily, organic soiling. Soap cleans by acting as an emulsifier. Basically, soap allows oil and water to mix so that oily grime can be removed during rinsing. Detergents were developed in response to the shortage of the animal and vegetable fats used to make soap during World War I and World War II. Detergents are primarily surfactants, which could be produced easily from petrochemicals. |
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