Question

A drop of oil is placed on the surface of water. Which of the following statement is correct?

• A. It will remain on it as a sphere
• B. It will spread as a thin layer
• C. It will partly be as spherical droplets and partly as thin film
• D. It will float as distorted drop on the water surface.

Answer 1

The correct option is B It will spread as a thin layer

Adhesive force between oil and water molecules is greater than cohesive force between oil molecules. So the oil molecules do not mix with water molecules. As a result, oil spreads on the water surface forming a thin layer.