The halogens, which are not attacked by conc. `HNO_(3)`, are

Options

A. `F_(2)`
B. `CI_(2)`
C. `BR_(2)`
D. `I_(2)`

Answer

To solve the question of which halogens are not attacked by concentrated HNO3, we need to analyze the reactivity of each halogen with concentrated nitric acid.

### Step-by-Step Solution:

1. **Understanding the Reactivity of Halogens**:
The halogens are a group of elements in Group 17 of the periodic table, which includes Fluorine (F2), Chlorine (Cl2), Bromine (Br2), and Iodine (I2). Each of these halogens has different reactivity levels.

2. **Analyzing the Reaction with Concentrated HNO3**:
Concentrated nitric acid (HNO3) is a strong oxidizing agent. It can oxidize certain substances while itself being reduced in the process.

3. **Reactions of Each Halogen with HNO3**:
- **Iodine (I2)**: When I2 reacts with concentrated HNO3, it produces HIO3 (iodic acid), NO2 (nitrogen dioxide), and water. This indicates that iodine is oxidized from an oxidation state of 0 to +5.
- **Fluorine (F2)**: Fluorine is highly reactive and does not react with concentrated HNO3 under normal conditions.
- **Chlorine (Cl2)**: Chlorine also does not react with concentrated HNO3.
- **Bromine (Br2)**: Bromine does not react with concentrated HNO3 either.

4. **Conclusion**:
From the analysis, we find that I2 is the only halogen that reacts with concentrated HNO3, while F2, Cl2, and Br2 do not react with it. Therefore, the halogens that are not attacked by concentrated HNO3 are Fluorine (F2), Chlorine (Cl2), and Bromine (Br2).

### Final Answer:
The halogens which are not attacked by concentrated HNO3 are:
- Fluorine (F2)
- Chlorine (Cl2)
- Bromine (Br2)