A : Glass belongs to the category of covalent network solid.
R : Unit cell of glass is hexagonal.

Options

A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)
B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided.

### Step 1: Analyze the Assertion (A)
- **Assertion (A)**: "Glass belongs to the category of covalent network solid."
- **Explanation**: Glass is actually classified as an amorphous solid, not a covalent network solid. In covalent network solids, atoms are bonded in a continuous network, which gives them a definite structure. Glass does not have a long-range order and its particles are arranged randomly, which is characteristic of amorphous solids.

### Step 2: Analyze the Reason (R)
- **Reason (R)**: "Unit cell of glass is hexagonal."
- **Explanation**: The term "unit cell" refers to the smallest repeating unit in a crystalline structure. Since glass is amorphous, it does not have a defined unit cell or a specific geometric arrangement like crystalline solids do. Therefore, it cannot be described as having a hexagonal unit cell.

### Step 3: Conclusion
- Both the assertion and the reason are false. Glass is not a covalent network solid; it is an amorphous solid, and it does not have a defined unit cell structure.

### Final Answer
- Both assertion (A) and reason (R) are false statements.