Calculate the oxidation number of sulphur, chromium, and nitrogen in `H_(2)SO_(5), Cr_(2)O_(7)^(2-)` and `NO_(3)^(Θ)`. Suggest the structure of these compounds. Count for the fallacy.

Explanation

To calculate the oxidation numbers of sulfur in \( H_2SO_5 \), chromium in \( Cr_2O_7^{2-} \), and nitrogen in \( NO_3^{-} \), we will follow a systematic approach for each compound.

### Step 1: Calculate the oxidation number of sulfur in \( H_2SO_5 \)

1. **Assign variables**: Let the oxidation number of sulfur be \( x \).
2. **Assign known oxidation states**:
- Hydrogen (\( H \)) has an oxidation state of \( +1 \) (2 hydrogens contribute \( +2 \)).
- Oxygen (\( O \)) typically has an oxidation state of \( -2 \) (5 oxygens contribute \( -10 \)).
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