Question

Which of the following is a negative charge colloidal sol?

• A. Gold
• B. S
• C. Clay
• D. All of these

Hint:

Negative charge colloidal sols are often more stable than positive charge sols because the repulsion between similarly charged particles helps prevent aggregation. This property is used in various applications like water purification and drug delivery systems.

Answer 1

The Correct Option is D

In chemistry, colloidal sols are mixtures where fine particles are dispersed in a continuous medium. A negative charge colloidal sol is a type of colloid where the dispersed phase has negative charges on its surface. Let us explore the common negative charge colloidal sols listed in the options:

• Gold sol: Gold sol is a classic example of a negatively charged colloidal sol. The surface of tiny gold particles dispersed in water carries a negative charge.
• Sulfur sol (S): Sulfur in water forms a negatively charged colloidal sol due to the repulsion between the negatively charged sulfate ions attaching to the sulfur particles.
• Clay: Clay particles in water also carry a negative charge due to ionization at the edges, making it a negatively charged colloidal sol.

All the options listed (Gold, S, Clay) are examples of negative charge colloidal sols. Therefore, the correct answer is:

All of these