`KHF_(2)` is known but `KHCl_(2)` is not known. Give reasons.

Explanation

To understand why \( KHF_2 \) is known while \( KHCl_2 \) is not, we can break down the reasoning into several steps:

### Step 1: Understanding the Composition of \( KHF_2 \) and \( KHCl_2 \)
- \( KHF_2 \) consists of potassium ions \( K^+ \) and the polyatomic ion \( HF_2^- \).
- \( KHCl_2 \) consists of potassium ions \( K^+ \) and the polyatomic ion \( HCl_2^- \).

### Step 2: Analyzing the Structure of \( HF_2^- \)
- The \( HF_2^- \) ion is formed when one hydrogen atom is bonded to two fluorine atoms.
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