The size of colloidal particles ranges between:

• A. 10⁻⁷ - 10⁻⁹ cm
• B. 10⁻⁹ - 10⁻¹¹ cm
• C. 10⁻⁵ - 10⁻⁷ cm
• D. 10⁻² - 10⁻³ cm

Colloidal particles are typically found in a specific size range that distinguishes them from larger particles and smaller molecules. The correct range for colloidal particles is:

Correct Answer

A. 10⁻⁷ - 10⁻⁹ cm

Understanding Colloidal Size

Colloids consist of tiny particles that are larger than molecules but smaller than what can be seen with the naked eye. This size range allows them to remain suspended in a medium, which is a key characteristic of colloidal systems.

Examples of Colloids

• Milk
• Paint
• Fog

These examples illustrate how colloidal particles can be dispersed in various substances, contributing to their unique properties and behaviors.