The movement of colloidal particles under an applied
electrical potential is called

Options

A. Precipitation
B. Stabilisation
C. Electrophoresis
D. Brownian movement

Answer

To solve the question, we need to identify the term that describes the movement of colloidal particles when an electric potential is applied. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand Colloidal Particles
Colloidal particles are small particles that are dispersed in a medium. They can carry a charge, which is important for their movement under an electric field.

**Hint:** Recall that colloids consist of tiny particles that can remain suspended in a medium due to their size and charge.

### Step 2: Recognize the Effect of Electric Potential
When an electric potential is applied to a system containing charged particles, these particles will experience a force due to the electric field. Charged particles will move towards the electrode that has the opposite charge.

**Hint:** Think about how charged objects behave in an electric field – positive charges move towards negative electrodes and vice versa.

### Step 3: Identify the Process
The specific movement of charged colloidal particles under the influence of an electric field is a well-defined process in colloidal chemistry. This process is known as electrophoresis.

**Hint:** Consider the term that combines "electro" (related to electricity) and "phoresis" (meaning to carry or move).

### Conclusion
The movement of colloidal particles under an applied electrical potential is called **electrophoresis**.

**Final Answer:** Electrophoresis