Chemistry
Grade-7
Easy
Question
Which of the following is the incorrect statement regarding the detergent?
- They reduce the surface tension of water.
- They are exclusively used in soft water.
- They are used in both soft and hard water.
- They can be made from benzene sulphonic acid.
Hint:
Detergents separate water molecules from one another.
The correct answer is: They reduce the surface tension of water.
- "They reduce the surface tension of water" is the incorrect statement regarding the detergent.
- Adding detergent to water lowers the surface tension of the water. Compounds that lower the surface tension of water is called surfactants and work by separating water molecules from each other.
- In this activity, the surface tension is reduced in the surfactant-loaded area and the higher surface tension in front of the raft pulls the raft forward.
- As the detergent disperses throughout the water, the surface tension of the entire water decreases and the raft eventually become immobile because there is no difference in surface tension.
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