Which one of the hydracid does not form any precipiate with `AgNO_(3)` ?

Options

A. HF
B. HCl
C. HBr
D. HI

Answer

To determine which hydric acid does not form any precipitate with AgNO₃, we can analyze the behavior of various hydrogen halides when they react with silver nitrate.

### Step-by-Step Solution:

1. **Identify the Hydric Acids**:
The common hydrogen halides (hydric acids) are:
- Hydrofluoric acid (HF)
- Hydrochloric acid (HCl)
- Hydrobromic acid (HBr)
- Hydroiodic acid (HI)

2. **Understand the Reaction with AgNO₃**:
When these acids react with silver nitrate (AgNO₃), they can form silver halides (AgX), which are often insoluble and precipitate out of the solution. The general reaction can be represented as:
\[ HX + AgNO₃ \rightarrow AgX + HNO₃ \]
where X is the halogen (F, Cl, Br, I).

3. **Analyze Each Acid**:
- **HF (Hydrofluoric Acid)**:
- When HF reacts with AgNO₃, it forms AgF. However, AgF is soluble in water, meaning it does not precipitate.
- **HCl (Hydrochloric Acid)**:
- HCl reacts with AgNO₃ to form AgCl, which is insoluble in water and forms a white precipitate.
- **HBr (Hydrobromic Acid)**:
- HBr reacts with AgNO₃ to form AgBr, which is also insoluble in water and forms a pale yellow precipitate.
- **HI (Hydroiodic Acid)**:
- HI reacts with AgNO₃ to form AgI, which is insoluble in water and forms a yellow precipitate.

4. **Conclusion**:
From the analysis, we see that HF does not form a precipitate with AgNO₃, while HCl, HBr, and HI do form precipitates. Therefore, the answer to the question is:
\[ \text{HF (Hydrofluoric Acid)} \]

### Final Answer:
**HF (Hydrofluoric Acid)** does not form any precipitate with AgNO₃.

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