Balance the chemical equation by the oxidation number method.
(ii) `P + HNO_(3) to HPO_(3) + NO + H_(2)O`

Explanation

To balance the chemical equation \( P + HNO_3 \rightarrow HPO_3 + NO + H_2O \) using the oxidation number method, follow these steps:

### Step 1: Assign Oxidation Numbers
- For elemental phosphorus \( P \), the oxidation state is \( 0 \).
- In \( HNO_3 \):
- Hydrogen \( H \) is \( +1 \)
- Oxygen \( O \) is \( -2 \) (there are 3 O, contributing \( -6 \))
- Let \( N \) be \( x \): \( +1 + x - 6 = 0 \) → \( x = +5 \)
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