MCQ
Select most stable complex
- A$[Co(NH_3)_6]^{3+}$
- B$[Co(NH_3)_2(en)_2]^{3+}$
- C$[Co(NH_3)_4]^{3+}$
- ✓$[Co(en)_3]^{3+}$
✓
Answer
Correct option: D.
$[Co(en)_3]^{3+}$
d
$\left[ Co ( en )_3\right]^{3+}$ is more stable than $\left[ Co \left( NH _3\right)_6\right]^{3+}$ as $\left[ Co ( en )_3\right]^{3+}$ is a metal chelate due to presece of bidentate ligand ethylene diamine ligand. Metal chelates are more stable than complexes containing only monodentate lignads.
$\left[ Co ( en )_3\right]^{3+}$ is more stable than $\left[ Co \left( NH _3\right)_6\right]^{3+}$ as $\left[ Co ( en )_3\right]^{3+}$ is a metal chelate due to presece of bidentate ligand ethylene diamine ligand. Metal chelates are more stable than complexes containing only monodentate lignads.
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