Number of P-H, P-O-P, P-O-H and P=O bonds in sodium dihydrogen pyrophosphate respectively are:

Options

A. `1, 1, 1, 2`
B. `0, 1, 2, 2`
C. `0, 1, 2, 4`
D. `2, 0, 0, 2`

Answer

To solve the question regarding the number of P-H, P-O-P, P-O-H, and P=O bonds in sodium dihydrogen pyrophosphate (Na2H2P2O7), we will follow these steps:

### Step-by-Step Solution:

1. **Identify the Molecular Formula**:
The molecular formula for sodium dihydrogen pyrophosphate is Na2H2P2O7. This indicates that there are 2 sodium (Na) atoms, 2 hydrogen (H) atoms, 2 phosphorus (P) atoms, and 7 oxygen (O) atoms.

2. **Draw the Structure**:
To analyze the bonds, we need to visualize the structure. The structure can be represented as:
- Two phosphorus atoms connected by an oxygen atom (P-O-P).
- Each phosphorus atom is bonded to oxygen atoms and hydroxyl groups (OH).
- The double bonds between phosphorus and oxygen (P=O) need to be accounted for as well.

3. **Count P-H Bonds**:
In the structure, look for P-H bonds:
- There are no direct P-H bonds in sodium dihydrogen pyrophosphate. Therefore, the number of P-H bonds is **0**.

4. **Count P-O-P Bonds**:
Next, identify the P-O-P bonds:
- There is one P-O-P bond connecting the two phosphorus atoms. Thus, the number of P-O-P bonds is **1**.

5. **Count P-O-H Bonds**:
Now, count the P-O-H bonds:
- Each phosphorus atom has one hydroxyl group (OH) attached. Therefore, there are two P-O-H bonds (one from each phosphorus). Thus, the number of P-O-H bonds is **2**.

6. **Count P=O Bonds**:
Finally, identify the P=O bonds:
- Each phosphorus atom is double-bonded to one oxygen atom. Therefore, there are two P=O bonds (one from each phosphorus). Thus, the number of P=O bonds is **2**.

7. **Compile the Results**:
Now, we can compile the results:
- Number of P-H bonds: **0**
- Number of P-O-P bonds: **1**
- Number of P-O-H bonds: **2**
- Number of P=O bonds: **2**

### Final Answer:
The number of P-H, P-O-P, P-O-H, and P=O bonds in sodium dihydrogen pyrophosphate are: **0, 1, 2, 2** respectively.