Amongst the following , the most stable complex is :
(a) `[Fe(H_(2)O)_(6)]^(3+)` (b) `[Fe(NH_(3))_(6)]^(3+)` (c) `[Fe(C_(2)O_(4))_(3)]^(3-)` (d) `[FeCl_(6)]^(3-)` .

Explanation

To determine which of the given complexes is the most stable, we will analyze each option based on the oxidation state of iron and the nature of the ligands involved.

**Step 1: Identify the oxidation state of iron in each complex.**

1. **For `[Fe(H₂O)₆]^(3+)`:**
- The oxidation state of iron (Fe) is +3.
- Water (H₂O) is a neutral ligand, contributing 0 charge.

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