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  4. Adding detergents to water helps in removing dirty greasy stains. This is because 1. It increases the oil-water surface tension 2. It decreases the oil-water surface tension 3. It increases the viscosity of the solution 4. Dirt is held suspended surrounded by detergent molecules

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Q. Adding detergents to water helps in removing dirty greasy stains. This is because
1. It increases the oil-water surface tension
2. It decreases the oil-water surface tension
3. It increases the viscosity of the solution
4. Dirt is held suspended surrounded by detergent molecules

AMUAMU 2010Mechanical Properties of Fluids

Solution:

Adding detergents to water helps in removing dirty greasy stains. This is because it decreases the oil water surface tension and dirt is held suspended surrounded by detergent molecules.