Transition metal complex with highest value of crystal field splitting `(Delta_0)` will be

Options

A. `[Cr(H_2O)_6]^(3+)`
B. `[Mo(H_2O)_6]^(3+)`
C. `[Fe(H_2O)_6]^(3+)`
D. `[Os(H_2O)_6]^(3+)`

Explanation

To determine the transition metal complex with the highest value of crystal field splitting (Δ₀), we need to consider two main factors: the charge on the metal ion and the strength of the ligand.

### Step-by-Step Solution:

1. **Understanding Crystal Field Splitting (Δ₀)**:
- Crystal field splitting energy (Δ₀) is the energy difference between the split d-orbitals in a transition metal complex. It is influenced by the metal ion's charge and the ligand's strength.

2. **Effect of Metal Ion Charge**:
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