A salt solution reacts with some drops of chloroform and the mixture is shaken with chlorine water. The chloroform layer becomes violet. Salt solution contains:

Options

A. `NO_(2)^(-)` ion
B. `NO_(3)^(-)` ion
C. `Br^(-)`ion
D. `I^(-)`ion

Answer

To solve the question, we need to analyze the given information about the salt solution, chloroform, and chlorine water. The key observation is that the chloroform layer turns violet after shaking with chlorine water. Let's break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding the Reaction**:
- The question states that a salt solution is mixed with chloroform and shaken with chlorine water. The chloroform layer becomes violet, indicating a reaction involving halogens.

2. **Identifying the Halogens**:
- The chlorine water test is used to detect halide ions (like bromide and iodide) in the solution. The color change in chloroform indicates the presence of a halogen.

3. **Analyzing Possible Halides**:
- The possible halides in the salt solution could be:
- Nitrite (NO2^-)
- Nitrate (NO3^-)
- Bromide (Br^-)
- Iodide (I^-)

4. **Eliminating Non-Halides**:
- Nitrite and nitrate ions do not produce a color change in chloroform. Therefore, they can be eliminated as possibilities.

5. **Reactions with Bromide and Iodide**:
- The reaction of bromide ions (Br^-) with chlorine (Cl2) produces bromine (Br2), which gives a yellow to reddish-brown color.
- The reaction of iodide ions (I^-) with chlorine (Cl2) produces iodine (I2), which gives a violet color in chloroform.

6. **Conclusion**:
- Since the chloroform layer turns violet, this indicates the presence of iodide ions in the salt solution. Therefore, the salt solution contains iodide ions.

### Final Answer:
The salt solution contains iodide ions (I^-).

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