Assign oxidation number to the underlined elements in each of the following species :
`H_(4)ul(P)_(2)O_(7)`

Explanation

To assign the oxidation number to phosphorus in the compound \( H_4P_2O_7 \), we can follow these steps:

### Step 1: Write down the formula
We start with the given chemical formula:
\[ H_4P_2O_7 \]

### Step 2: Assign known oxidation states
- The oxidation state of hydrogen (H) is typically +1.
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