Which among the hydrides of group 17 elements is: (i) most volatile (ii) most stable (iii) strongest reducing agent?

Explanation

To solve the question regarding the hydrides of group 17 elements (HF, HCl, HBr, and HI), we need to analyze each hydride based on the criteria provided: volatility, stability, and reducing agent strength.

### Step-by-Step Solution:

1. **Identify the Hydrides of Group 17 Elements**:
- The hydrides of group 17 (halogens) are HF (Hydrogen Fluoride), HCl (Hydrogen Chloride), HBr (Hydrogen Bromide), and HI (Hydrogen Iodide).

2. **Determine the Most Volatile Hydride**:
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