Which of the following when dissolving in water forms a solution which is non-conducting?

Options

A. Green vitriol
B. Chlile or Indian salt petre
C. Alcohol
D. Potash alum

Answer

To determine which of the given options forms a non-conducting solution when dissolved in water, we need to analyze each option based on its ability to dissociate into ions. A non-conducting solution does not contain free ions, which are necessary for electrical conductivity.

### Step-by-Step Solution:

1. **Understanding Non-Conducting Solutions:**
- A non-conducting solution does not allow electricity to pass through it. This typically means that the solution does not contain free ions.

2. **Analyzing Option A: Green Vitriol (FeSO4·7H2O):**
- When green vitriol dissolves in water, it dissociates into Fe²⁺ and SO₄²⁻ ions.
- Since it produces ions, the solution will conduct electricity.
- **Conclusion:** This option is not correct.

3. **Analyzing Option B: Chile Saltpetre (NaNO3):**
- When NaNO3 dissolves in water, it dissociates into Na⁺ and NO₃⁻ ions.
- This also results in a solution that conducts electricity due to the presence of ions.
- **Conclusion:** This option is not correct.

4. **Analyzing Option C: Alcohol (e.g., CH3OH or C2H5OH):**
- Alcohols do not dissociate into ions when dissolved in water. They remain as neutral molecules.
- Since there are no free ions in the solution, it will not conduct electricity.
- **Conclusion:** This option is correct.

5. **Analyzing Option D: Potash Alum (KAl(SO4)2·12H2O):**
- When potash alum dissolves in water, it dissociates into K⁺, Al³⁺, and SO₄²⁻ ions.
- This means the solution will conduct electricity due to the presence of these ions.
- **Conclusion:** This option is not correct.

### Final Answer:
The correct answer is **Option C: Alcohol**, as it forms a non-conducting solution when dissolved in water.

---