Which of the following are correct statements ?

Options

A. Oxides of phosphorus, `P_(2)O_(3) and P_(2)O_(5)` exist as monomers
B. Solid `PCl_(5)` exists as tetrahedral `[PCl_(4)]^(+)` and octahedral `[PCl_(6)]^(-)` ions
C. Solid `PBr_(5)` exists as `[PBr_(4)]^(+) Br^(-)`
D. Solid `N_(2)O_(5)` exists as `NO_(2)^(+)NO_(3)^(-)`

Explanation

To determine which statements about the phosphorus oxides and their structures are correct, we can analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement:** Oxide of Phosphorus P2O3 and P2O5 exist as monomers.

**Analysis:**
- P2O3 (phosphorus trioxide) and P2O5 (phosphorus pentoxide) do not exist as monomers.
- Instead, they exist as dimers.
- Therefore, this statement is **incorrect**.

### Step 2: Analyze the second statement
**Statement:** P2O5 exists as PCl4+ (tetrahedral) and P2O6- (octahedral).

**Analysis:**
- P2O5 can be represented as PCl4+ in a tetrahedral geometry, which is correct.
- P2O6- can be represented as having an octahedral geometry, which is also correct.
- Therefore, this statement is **correct**.

### Step 3: Analyze the third statement
**Statement:** Solid PBr5 exists as PBr4+ and Br-.

**Analysis:**
- PBr5 (phosphorus pentabromide) does dissociate in solid state to form PBr4+ and Br-.
- This statement is therefore **correct**.

### Step 4: Analyze the fourth statement
**Statement:** Solid N2O5 exists as NO2+ and NO3-.

**Analysis:**
- N2O5 (dinitrogen pentoxide) can indeed dissociate into NO2+ and NO3- in solid form.
- This statement is therefore **correct**.

### Conclusion
After analyzing all the statements, we find:
- The first statement is **incorrect**.
- The second, third, and fourth statements are **correct**.

### Final Answer
The correct statements are:
- Statement 2: Correct
- Statement 3: Correct
- Statement 4: Correct