How many of the following compounds has `X-X` bonds `i.e.,`
single covalent bond between two same elements in their molecules `H_(4)P_(2)O_(6), H_(4)P_(2)O_(5), H_(4)P_(2)O_(7), N_(2)O, N_(2)O_(3), N_(2)O_(4), N_(2)O_(5)`,
`(HPO_(3))_(3)`.

Options

A. 4
B. 5
C. 3
D. 6

Explanation

To determine how many of the given compounds have `X-X` bonds (i.e., single covalent bonds between two same elements), we will analyze each compound one by one.

### Step 1: Analyze H₄P₂O₆
- **Structure**: H₄P₂O₆ (Diphosphoric acid) contains phosphorus (P) and oxygen (O) atoms.
- **Bond Analysis**: The P-P bond is a single bond between two phosphorus atoms.
- **Conclusion**: Contains 1 `P-P` bond.

### Step 2: Analyze H₄P₂O₅
- **Structure**: H₄P₂O₅ (Phosphoric acid) also contains phosphorus and oxygen.
- **Bond Analysis**: Similar to H₄P₂O₆, it has a P-P bond.
- **Conclusion**: Contains 1 `P-P` bond.

### Step 3: Analyze H₄P₂O₇
- **Structure**: H₄P₂O₇ (Pyrophosphoric acid) contains phosphorus and oxygen.
- **Bond Analysis**: It also has a P-P bond.
- **Conclusion**: Contains 1 `P-P` bond.

### Step 4: Analyze N₂O
- **Structure**: N₂O (Nitrous oxide) contains nitrogen (N) and oxygen (O).
- **Bond Analysis**: There is a single bond between the two nitrogen atoms (N-N).
- **Conclusion**: Contains 1 `N-N` bond.

### Step 5: Analyze N₂O₃
- **Structure**: N₂O₃ (Nitrogen trioxide) contains nitrogen and oxygen.
- **Bond Analysis**: There is a single bond between the two nitrogen atoms (N-N).
- **Conclusion**: Contains 1 `N-N` bond.

### Step 6: Analyze N₂O₄
- **Structure**: N₂O₄ (Dinitrogen tetroxide) contains nitrogen and oxygen.
- **Bond Analysis**: There is a single bond between the two nitrogen atoms (N-N).
- **Conclusion**: Contains 1 `N-N` bond.

### Step 7: Analyze N₂O₅
- **Structure**: N₂O₅ (Dinitrogen pentoxide) contains nitrogen and oxygen.
- **Bond Analysis**: There is a single bond between the two nitrogen atoms (N-N).
- **Conclusion**: Contains 1 `N-N` bond.

### Step 8: Analyze (HPO₃)₃
- **Structure**: (HPO₃)₃ (Triphosphoric acid) contains phosphorus and oxygen.
- **Bond Analysis**: This compound does not have a P-P bond, as it is a polymeric structure.
- **Conclusion**: Contains no `P-P` bond.

### Final Count
Now, let's summarize the findings:
- H₄P₂O₆: 1 `P-P` bond
- H₄P₂O₅: 1 `P-P` bond
- H₄P₂O₇: 1 `P-P` bond
- N₂O: 1 `N-N` bond
- N₂O₃: 1 `N-N` bond
- N₂O₄: 1 `N-N` bond
- N₂O₅: 1 `N-N` bond
- (HPO₃)₃: 0 bonds

### Total Compounds with `X-X` Bonds
Total = 7 compounds with `X-X` bonds.