To determine which type of water has the minimum conductivity among the given options, we will analyze each option based on the presence of ions, as conductivity is directly related to the number of ions in the solution.
### Step-by-Step Solution:
1. **Understanding Conductivity**:
- Conductivity in water is primarily due to the presence of ions. The more ions present, the higher the conductivity.
2. **Analyzing Distilled Water (Option A)**:
- Distilled water is produced by boiling water and condensing the steam back into a liquid. This process removes impurities and dissolved salts.
- In distilled water, the concentration of ions (H⁺ and OH⁻) is very low, approximately \(10^{-7}\) M each.
- Therefore, distilled water has very few ions and thus has low conductivity.
3. **Analyzing Seawater (Option B)**:
- Seawater contains a variety of dissolved salts, including NaCl, CaCl₂, and others.
- These salts dissociate into ions (e.g., Na⁺, Cl⁻, Ca²⁺), resulting in a high concentration of ions.
- Consequently, seawater has high conductivity.
4. **Analyzing Saline Water (Option C)**:
- Saline water, especially the type used for intravenous injections, contains electrolytes such as sodium and potassium ions.
- This type of water also has a significant concentration of ions, leading to high conductivity.
5. **Analyzing Well Water (Option D)**:
- Well water often contains various dissolved minerals and salts, including Fe²⁺, Na⁺, and others.
- The presence of these ions contributes to a higher conductivity compared to distilled water.
6. **Conclusion**:
- Among the options analyzed, distilled water has the least number of ions and therefore the lowest conductivity.
- Thus, the correct answer is **Option A: Distilled Water**.
