In NaCl there are ________ schottky pairs per `cm^(3)` at room temperature

Options

A. `10^(22)`
B. `10^(16)`
C. `10^(6)`
D. `10^(12)`

Answer

To solve the question regarding the number of Schottky pairs in NaCl at room temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Schottky Defects**:
- Schottky defects occur in ionic solids like NaCl, where an equal number of cations (Na⁺) and anions (Cl⁻) are missing from the lattice, creating vacancies.

2. **Identify the Temperature Condition**:
- The question specifies "at room temperature," which is typically around 25°C (298 K). At this temperature, we can refer to known values for ionic solids.

3. **Refer to Known Data**:
- It is a well-established fact in solid-state chemistry that NaCl has a specific concentration of Schottky defects at room temperature.

4. **State the Value**:
- For NaCl, the number of Schottky pairs (vacancies) per cubic centimeter at room temperature is approximately \(10^6\).

5. **Conclude the Answer**:
- Therefore, the answer to the question is that in NaCl, there are approximately \(10^6\) Schottky pairs per cm³ at room temperature.

### Final Answer:
In NaCl, there are approximately \(10^6\) Schottky pairs per cm³ at room temperature.

---