Isoelectric point is the `pH` at which colloidal particles

Options

A. Coagulate
B. Becomes electrically neutral.
C. Can move toward either electrodes
D. None of these

Answer

To solve the question regarding the isoelectric point of colloidal particles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Concept of Isoelectric Point**:
- The isoelectric point (pI) is defined as the pH at which a colloidal particle carries no net electrical charge. At this point, the positive and negative charges on the particle balance each other out.

2. **Analyzing the Options**:
- **Option 1: Coagulate** - Coagulation refers to the process where colloidal particles aggregate to form larger particles, which typically occurs when they have a net charge. This does not define the isoelectric point.
- **Option 2: Becomes electrically neutral** - This option suggests that at the isoelectric point, the colloidal particles have no net charge, which aligns with the definition of the isoelectric point.
- **Option 3: Can move toward either electrodes** - At the isoelectric point, colloidal particles do not migrate towards either electrode because they have no net charge.
- **Option 4: None of these** - This option implies that none of the previous statements are correct.

3. **Determining the Correct Answer**:
- Based on the definitions and analysis of the options, the correct answer is **Option 2: becomes electrically neutral**. This is because at the isoelectric point, the colloidal particles have no net charge and thus are electrically neutral.

### Final Answer:
The correct option is **Option 2: becomes electrically neutral**.

---