Give the oxidation state, d-orbital occupation and coordination number of the central metal ion in the following complexes: `K_3[Co(C_2O_4)_3]`

Explanation

To solve the question regarding the complex \( K_3[Co(C_2O_4)_3] \), we need to determine the oxidation state, d-orbital occupation, and coordination number of the central metal ion, which is cobalt (Co).

### Step 1: Determine the Oxidation State of Cobalt
1. **Identify the charges**:
- Potassium (K) has a charge of +1. Since there are 3 potassium ions, the total positive charge contributed by potassium is \( 3 \times (+1) = +3 \).
- The oxalate ion \((C_2O_4)^{2-}\) has a charge of -2. Since there are 3 oxalate ions, the total negative charge contributed by oxalate is \( 3 \times (-2) = -6 \).

2. **Set up the equation**:
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