Assertion :In `NaCI`crystal each `Na^(+)` ion is tourching `6 CI^(-)` ion but these `CI^(-)` ion do not touch each other
Reason:The radius ratio is greater than `0.414` required forexact fitting

Options

A. Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-1
B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
C. Statement-1 is True, Statement-2 is False.
D. Statement-1 is False, Statement-2 is True.

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that in NaCl crystal, each Na⁺ ion is touching six Cl⁻ ions, but these Cl⁻ ions do not touch each other.

- In a NaCl crystal structure, Na⁺ ions occupy the octahedral voids, while Cl⁻ ions form a face-centered cubic (FCC) lattice. Each Na⁺ ion is surrounded by six Cl⁻ ions, confirming the first part of the assertion.

### Step 2: Analyze the Cl⁻ Ion Arrangement
Now, we need to verify the second part of the assertion, which claims that Cl⁻ ions do not touch each other.

- In the FCC lattice, Cl⁻ ions are located at the corners and the face centers of the unit cell. When we look at the arrangement, Cl⁻ ions at the corners of the unit cell do touch each other along the face diagonal. Therefore, this part of the assertion is incorrect.

### Step 3: Understand the Reason
The reason states that the radius ratio is greater than 0.414, which is required for exact fitting.

- The radius ratio (r⁺/r⁻) for Na⁺ and Cl⁻ is approximately 0.523 (where r⁺ is the radius of Na⁺ and r⁻ is the radius of Cl⁻). This value is indeed greater than 0.414, which supports the formation of the NaCl structure.

### Conclusion
- The assertion is **false** because Cl⁻ ions do touch each other along the face diagonal.
- The reason is **true** because the radius ratio is greater than 0.414, which is necessary for the structure.

Thus, the correct answer is that the assertion is false, and the reason is true.

### Final Answer
- Assertion: False
- Reason: True