Which of the following is not hygroscopic-

Options

A. `NaCl`
B. `MgCl_(2)`
C. `CaCl_(2)`
D. `LiCl`

Answer

To determine which of the following substances is not hygroscopic, we can follow these steps:

### Step 1: Understand Hygroscopic Substances
Hygroscopic substances are those that can absorb moisture from the air. This property is important in various applications, including food preservation and chemical storage.

### Step 2: Identify the Given Options
The options provided in the question are A, B, C, and D. We need to analyze each option to determine which one does not exhibit hygroscopic behavior.

### Step 3: Analyze Each Option
1. **Option A: NaCl (Sodium Chloride)** - Sodium chloride is commonly known as table salt. It is not hygroscopic and does not absorb moisture from the air under normal conditions.

2. **Option B: MgCl2 (Magnesium Chloride)** - Magnesium chloride is hygroscopic and readily absorbs moisture from the air.

3. **Option C: CaCl2 (Calcium Chloride)** - Calcium chloride is also hygroscopic and is often used as a desiccant because of its ability to absorb water.

4. **Option D: LiCl (Lithium Chloride)** - Lithium chloride is hygroscopic and can absorb moisture from the atmosphere.

### Step 4: Conclusion
Based on the analysis, the only substance that is not hygroscopic among the options is **NaCl (Sodium Chloride)**. Therefore, the correct answer is **Option A**.

### Final Answer:
**Option A: NaCl (Sodium Chloride) is not hygroscopic.**

---