Give one chemical method for the preparation of flourine.

Explanation

### Step-by-Step Solution:

**Step 1: Identify the Chemical Method**
The chemical method for the preparation of fluorine (F2) is through the electrolysis of potassium bifluoride (KHF2).

**Step 2: Set Up the Electrolysis**
In this process, KHF2 is used as the electrolyte. When an electric current is passed through the solution, it undergoes electrolysis.

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