Which of the following pair consists of only network solid?

Options

A. `SiO_(2), P_(4)O_(10)`
B. `P_(4)O_(10), SO_(3)`
C. `P_(3)O_(10), P_(4)O_(6)`
D. Diamond, `SiO_(2)`

Answer

To determine which of the following pairs consists of only network solids, we need to analyze each option based on the definition of network solids. Network solids are characterized by a continuous three-dimensional network of covalent bonds.

### Step-by-Step Solution:

1. **Identify the options:**
- Option A: SiO2, P4O10
- Option B: P4O10, SO3
- Option C: P3O10, P4O6
- Option D: Diamond, SiO2

2. **Analyze Option A (SiO2, P4O10):**
- **SiO2 (Silicon Dioxide):**
- SiO2 has a tetrahedral structure where each silicon atom is covalently bonded to four oxygen atoms, creating a vast network. This qualifies SiO2 as a network solid.
- **P4O10 (Tetraphosphorus Decaoxide):**
- P4O10 has a molecular structure with discrete P4O10 units. It does not form a continuous network. Thus, it is not a network solid.
- **Conclusion for Option A:** Not a pair of network solids.

3. **Analyze Option B (P4O10, SO3):**
- **SO3 (Sulfur Trioxide):**
- SO3 has a trigonal planar structure with sulfur at the center and three oxygen atoms bonded to it. It does not form a continuous network, so it is not a network solid.
- **Conclusion for Option B:** Not a pair of network solids.

4. **Analyze Option C (P3O10, P4O6):**
- **P3O10 (Triphosphorus Decaoxide):**
- P3O10 has a molecular structure and does not form a continuous network. Therefore, it is not a network solid.
- **P4O6 (Tetraphosphorus Hexaoxide):**
- Similar to P3O10, P4O6 also has a molecular structure and does not exhibit a continuous network. Hence, it is not a network solid.
- **Conclusion for Option C:** Not a pair of network solids.

5. **Analyze Option D (Diamond, SiO2):**
- **Diamond:**
- Diamond consists of carbon atoms arranged in a tetrahedral lattice, forming a three-dimensional network of covalent bonds. This qualifies diamond as a network solid.
- **SiO2 (Silicon Dioxide):**
- As previously established, SiO2 is also a network solid.
- **Conclusion for Option D:** This pair consists of only network solids.

### Final Answer:
The correct answer is **Option D: Diamond and SiO2**.

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