Assertion (A) : A tetrahedral void is surrounded by six spheres.
Reason (R) : In ionic solids, the bigger ions form the close packed structure and smaller ions occupy the voids.

Options

A. Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
B. Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
C. Assertion (A) is correct, but Reason (R) is incorrect statement.
D. Assertion (A) is incorrect, but Reason (R) is correct statement.

Answer

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

### Step 1: Analyze the Assertion
The assertion states that "A tetrahedral void is surrounded by six spheres."

- A tetrahedral void is defined as a void that is formed when four spheres are arranged at the corners of a tetrahedron.
- Therefore, the assertion is incorrect because a tetrahedral void is surrounded by **four spheres**, not six.

### Step 2: Analyze the Reason
The reason states that "In ionic solids, the bigger ions form the close packed structure and smaller ions occupy the voids."

- This statement is true. In ionic solids, larger cations (positive ions) typically form a close-packed structure, while smaller anions (negative ions) occupy the voids created by the arrangement of the larger ions.
- The voids can be tetrahedral or octahedral depending on the arrangement of the ions.

### Step 3: Conclusion
Since the assertion is false and the reason is true, we can conclude that the assertion does not support the reason. Therefore, the correct answer is that the assertion is incorrect while the reason is correct.

### Final Answer
- Assertion (A) is false.
- Reason (R) is true.