Calculate the O.S. of all the central atoms in the following species :
(i) `ClO^(-), (ii) NO_(2)^(-) , (iii) NO_(3)^(-) , (iv) C Cl_(4), (v) K_(2)CrO_(4) " and " (vi) KMnO_(4)`

Explanation

To calculate the oxidation states (O.S.) of the central atoms in the given species, we will follow a systematic approach for each compound. Here’s the step-by-step solution:

### (i) ClO^(-)

1. **Identify the central atom**: Chlorine (Cl) is the central atom.
2. **Assign the oxidation state to oxygen (O)**: Oxygen typically has an oxidation state of -2.
3. **Set up the equation**: Let the oxidation state of Cl be \( x \).
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