Find out the oxidation number of CI in HCI , HCIO, `CIO_(4)^(-) and CIO_(2)`

Explanation

To find the oxidation number of chlorine (Cl) in the compounds HCl, HClO, ClO₄⁻, and ClO₂, we will follow a systematic approach.

### Step-by-Step Solution:

1. **Finding the oxidation state of Cl in HCl:**
- The oxidation state of hydrogen (H) is +1.
- Let the oxidation state of Cl be x.
- The equation can be set up as follows:
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