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5. Co-ordination chemistry — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry5. Co-ordination chemistry1 Mark
MCQ
The stabilization of coordination compounds due  to chelation is called the chelate effect. Which of the following is the most stable complex species ?
  • A
    $[Fe(CO)_5]$
  • ✓
    $[Fe(CN)_6]^{-3}$
  • C
    $[Fe(C_2O_4)_3]^{-3}$
  • D
    $[Fe(H_2O)_6]^{+3}$
✓

Answer

Correct option: B.
$[Fe(CN)_6]^{-3}$
b
Chelation (formation of cycle by linkage between metal ion and ligand) stabilizes the coordination compound. The ligand which chelates the metal ion are known as chelating ligand. Here, only $\left[F e\left(C_{2} O_{4}\right)_{3}\right]^{3}$ is a coordination compound which contains oxalate ion as a chelating ligand. Hence, it stabilizes coordination compound by chelating $F e^{3+}$ ion.

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