Which complex compound is most stable? - Chemistry MCQ NEET 2023 2026 | ExamTest.live | ExamTest.live

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Which complex compound is most stable?

A $[Co(NH_{3})_{6}]_{2} (SO_{4})_{3}$
B $[Co(NH_{3})_{3} (H_{2} O)_{3}] Cl_{3}$
C $[CoCl_{2} (en)_{2}] NO_{3}$
D $[Co(NH_{3})_{4} (H_{2} O) Cl] Cl_{2}$

Solution & Step-by-step Explanation

+ showing chelate rings]Complexes containing chelating ligands (multidendate ligands that form rings with the metal) are significantly more stable than those with similar monodentate ligands. This is called the chelate effect.Ethylenediamine (en) is a bidentate chelating ligand. Option C contains two 'en' ligands, forming stable five-membered rings. Therefore, it is the most stable among the given options.

Practice this question

Try it yourself before checking the explanation above.

Which complex compound is most stable?

A

[Co(NH_{3})_{6}]_{2} (SO_{4})_{3}

B

[Co(NH_{3})_{3} (H_{2} O)_{3}] Cl_{3}

C

[CoCl_{2} (en)_{2}] NO_{3}

D

[Co(NH_{3})_{4} (H_{2} O) Cl] Cl_{2}

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coordination compounds stability chelation

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