McqMate
| Q. |
Soap helps in better cleaning of clothes because - |
| A. | Soap acts like catalyst |
| B. | It reduces the surface tension of solution |
| C. | It gives strength to solution |
| D. | It absorbs the dirt |
| Answer» B. It reduces the surface tension of solution | |
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Explanation: Soaps are effective cleaners because they can dissolve and the oil and grease that holds dirt in place. They reduce the surface tension of the solution and enable it to wet things more uniformly. The surfactants in detergents improve water's ability to wet things, spread over surfaces, and seep into dirty clothes fibers. The surfactant molecules help water to get a hold of grease, break it up, and wash it away. |
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