On adding excess electrolyte what happens to the collides :-

Options

A. Coagulates
B. Dissolves
C. Peptizes
D. Disperses

Answer

To solve the question "On adding excess electrolyte what happens to the colloids?", we need to understand the behavior of colloids when an electrolyte is introduced. Here’s a step-by-step breakdown of the solution:

### Step 1: Understanding Colloids
Colloids are mixtures where tiny particles are dispersed throughout a continuous medium. These particles carry a charge, which helps keep them suspended in the medium.

**Hint:** Remember that the stability of colloids is often due to the charge on their particles.

### Step 2: Role of Electrolytes
Electrolytes are substances that dissociate into ions when dissolved in water. When an excess of electrolyte is added to a colloidal solution, the ions from the electrolyte can interact with the charged particles of the colloid.

**Hint:** Consider how ions from the electrolyte might affect the charges on the colloidal particles.

### Step 3: Neutralization of Charge
The ions from the electrolyte can neutralize the charge on the colloidal particles. This neutralization reduces the repulsive forces that keep the particles apart, allowing them to come closer together.

**Hint:** Think about what happens when the repulsive forces are diminished.

### Step 4: Coagulation of Colloids
As the particles come closer together due to the neutralization of their charge, they can aggregate and eventually precipitate out of the solution. This process is known as coagulation.

**Hint:** Recall that coagulation leads to the formation of larger aggregates that can settle out of the solution.

### Step 5: Conclusion
Therefore, when excess electrolyte is added to a colloidal solution, the colloids undergo coagulation. This means that the correct answer to the question is that the colloids coagulate.

**Final Answer:** On adding excess electrolyte, the colloids coagulate.