Read the given passage and answer the question that follow:
Colloidal particles always carry an electric charge which may be either positive or negative. For example, when `AgNO_3` solution is added to KI solution, a negatively charged colloidal sol is obtained. The presence of equal and similar charges on colloidal particles provide stability to the colloidal sol and if, somehow, charge is removed. coagulation of sol occurs. Lyophobic sols are readily coagulated as compared to lyophilic sols.
Name one method by which coagulation of lyophobic sol can be carried out.

Explanation

To answer the question regarding the coagulation of lyophobic sols, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Colloidal Particles**: Colloidal particles carry an electric charge, which can be either positive or negative. This charge is essential for the stability of the colloidal sol.

2. **Coagulation Process**: Coagulation occurs when the electric charge on colloidal particles is removed. This leads to the aggregation of particles, causing the sol to become unstable.

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