Out of `MgCl_2 and AICI_3` which one is more effective in causing coagulation of negatively charged sol and why?

Explanation

To determine which of the two electrolytes, MgCl₂ or AlCl₃, is more effective in causing coagulation of a negatively charged sol, we can follow these steps:

### Step 1: Understand the Concept of Coagulation
Coagulation is the process where particles in a colloidal solution aggregate to form a larger particle or precipitate. In the case of negatively charged sols, coagulation occurs when positively charged ions from an electrolyte are added to the solution.

### Step 2: Identify the Positive Ions of the Electrolytes
- For MgCl₂, the positive ion is Mg²⁺.
- For AlCl₃, the positive ion is Al³⁺.
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