Detergents clean surfaces on the principle of
A). Viscosity
B). Surface tension
C). Elasticity
D). Floatation
Surface tension
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. Surfactants lower the surface tension of water, essentially making it ‘wetter’ so that it is less likely to stick to itself and more likely to interact with oil and grease. Modern detergents contain more than surfactants. Cleaning products may also contain enzymes to degrade protein-based stains, bleaches to de-colour stains and add power to cleaning agents, and blue dyes to counter yellowing. Like soaps, detergents have hydrophobic or water-hating molecular chains and hydrophilic or water-loving components
1. Which one of the following elements is used in the manufacture of fertilizers
2. The atmospheric gas that is mainly responsible for green house effect :
3. Limestone is a raw material used by which industry?
4. Stains of rust on clothes can be removed by :
5. Which of the following is a natural dye ?
8. What is the most commonly used Substance in fluorescent tubes
9. Which of the following metals occurs In free state ?
10. The gas that is used in the manufacture of vanaspati ghee is :