Question

Soap solution is used for cleaning dirty clothes because

• A. surface tension of solution is decreased
• B. viscosity of solution is increased
• C. temperature of solution is decreased
• D. surface tension of solution is increased

Hint:

Cleaning agents work by reducing surface tension, which improves wetting and dirt removal.

Answer 1

The Correct Option is A

Step 1: Effect of soap on water.
Soap molecules reduce the surface tension of water by weakening the cohesive forces between water molecules.
Step 2: Cleaning action.
Lower surface tension allows the soap solution to spread easily and penetrate the fabric pores, helping to remove dirt and grease.
Step 3: Conclusion.
Therefore, soap solution is effective in cleaning because it decreases the surface tension of water.