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 determine 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 1: Write the Chemical Formula
The chemical formula for sodium dihydrogen pyrophosphate is Na2H2P2O7.

### Step 2: Draw the Structure
To analyze the bonds, we need to draw the structure of sodium dihydrogen pyrophosphate. The structure consists of two phosphorus (P) atoms connected by an oxygen (O) atom, along with other oxygen atoms and hydrogen (H) atoms.

1. **Phosphorus Atoms**: There are two phosphorus atoms.
2. **Oxygen Atoms**: There are seven oxygen atoms in total.
3. **Hydrogen Atoms**: There are two hydrogen atoms attached to the oxygen.

### Step 3: Identify the Bonds
Now, we will identify the specific bonds present in the structure:

1. **P-H Bonds**:
- There are no direct P-H bonds in the structure. The hydrogen atoms are bonded to oxygen atoms (OH groups).
- **Count**: 0 P-H bonds.

2. **P-O-P Bonds**:
- There is one P-O-P bond, which is the bond connecting the two phosphorus atoms through an oxygen atom.
- **Count**: 1 P-O-P bond.

3. **P-O-H Bonds**:
- There are two P-O-H bonds, corresponding to the two hydroxyl (OH) groups attached to the phosphorus atoms.
- **Count**: 2 P-O-H bonds.

4. **P-O Bonds**:
- There are four P-O bonds in total. This includes the bonds from each phosphorus atom to the surrounding oxygen atoms (not counting the double bonds).
- **Count**: 4 P-O bonds.

### Summary of Counts
- P-H bonds: 0
- P-O-P bonds: 1
- P-O-H bonds: 2
- P-O bonds: 4

### Final Answer
The number of P-H, P-O-P, P-O-H, and P-O bonds in sodium dihydrogen pyrophosphate respectively are: **0, 1, 2, 4**.

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