An oxyacid contains three hydrogen atoms, one phosphorus atom and four oxygen atoms.
Name the acid.

Explanation

To name the oxyacid that contains three hydrogen atoms, one phosphorus atom, and four oxygen atoms, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Elements**:
- The acid contains three hydrogen (H) atoms, one phosphorus (P) atom, and four oxygen (O) atoms.

2. **Understand Oxyacids**:
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