What is meant by coagulation of a colloidal solution? Name any method by which coagulation of lyophobic sols can be carried out.

Explanation

### Step-by-Step Solution

1. **Definition of Coagulation**: Coagulation of a colloidal solution refers to the process where colloidal particles aggregate and settle out of the solution. This occurs due to the addition of suitable electrolytes that neutralize the charge on the colloidal particles, leading to their aggregation.

2. **Mechanism of Coagulation**: When an electrolyte is added to a colloidal solution, it causes the charged colloidal particles to lose their charge. As a result, the particles are no longer repelled by each other and begin to clump together, forming larger aggregates. This process is known as induced aggregation.

3. **Observation During Coagulation**: For example, if we take a beaker filled with water and add a coagulant (an electrolyte), we will observe that the colloidal particles start to form precipitates. Over time, these precipitates will settle at the bottom of the beaker, effectively clearing the solution of the colloidal particles.

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