MCQ
Amongst the following, the most stable complex is :
- A$\left[ Fe \left( H _2 O \right)_6\right]^{3+}$
- B$\left[ Fe \left( NH _3\right)_6\right]^{3+}$
- ✓$\left.Fe \left( C _2 O _4\right)_3\right]^{3-}$
- D$\left[ FeCl _6\right]^{3-}$
✓
Answer
Correct option: C.
$\left.Fe \left( C _2 O _4\right)_3\right]^{3-}$
(C) Because it contains $C _2 O _4^{2-}$ (oxalate) ligand which is chelating and this increases stability.
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