Specify the oxidation number of the metals in the following coordination entities `[Co(H_2O) (CN)(en)_2]^(2+)`

Explanation

To determine the oxidation number of cobalt in the coordination entity \([Co(H_2O)(CN)(en)_2]^{2+}\), we follow these steps:

### Step 1: Identify the ligands and their charges
- **Water (H₂O)**: This ligand is neutral, so its charge is 0.
- **Cyanide (CN)**: This ligand has a charge of -1.
- **Ethylene diamine (en)**: This ligand is also neutral, so its charge is 0.

### Step 2: Set up the equation
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