Understanding the Cleansing Action of Soap

What is the primary role of soap in reducing the surface tension of water?

• To make water evaporate faster

• To allow water to wet the fabric thoroughly

• To change the color of the fabric

• To increase the temperature of water

How does the hydrophobic part of soap interact with grease?

• It dissolves in the grease

• It evaporates into the air

• It dissolves in water

• It changes the color of grease

What mechanical action helps in removing dirt from fabric?

• Freezing the fabric

• Heating the fabric

• Stretching the fabric

• Rubbing or tumbling the fabric

Why do the tiny oil droplets formed during the cleansing process repel each other?

• They have negative charges

• They have no charge

• They are too small to interact

• They have positive charges

What is the significance of understanding the cleansing action of soap for exams?

• It is not relevant for exams

• It helps in writing essays

• It helps in practical experiments

• It is a common exam question