What is the oxidation states of Cr in butterfly structure.

Explanation

To determine the oxidation state of chromium (Cr) in the butterfly structure represented by the chemical formula CrO5, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Compound**: The compound in question is CrO5, which consists of chromium and oxygen.

2. **Understand the Structure**: In CrO5, chromium is bonded to four peroxy (O-O) groups and one coordinated oxygen. The peroxy oxygen atoms are part of O-O linkages, and each peroxy oxygen carries a charge of -1. The coordinated oxygen is double-bonded to chromium and carries a charge of -2.

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