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

Explanation

To assign the oxidation number to phosphorus in the compound NaH₂PO₄, we can follow these steps:

### Step 1: Identify the oxidation states of known elements
- Sodium (Na) is an alkali metal and has an oxidation number of +1.
- Hydrogen (H) generally has an oxidation number of +1.
- Oxygen (O) typically has an oxidation number of -2.

### Step 2: Write the equation based on the oxidation states
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