Question
What is the coordination number of central metal ion in [ Co(en) _3]^ 3+ complex ?
MHT CET
Chemistry
Coordination Compounds
2026
MHT CET 2026 (20 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 2
- B. 4
- C. 6
- D. 8
Answer
C. 6
Step-by-step solution
The given complex is [ Co(en) _3]^ 3+ . The ligand 'en' stands for ethylenediamine, which is a bidentate ligand. This means each 'en' molecule coordinates to the central metal ion through two donor nitrogen atoms. Since there are three 'en' ligands attached to the central cobalt ion, the total number of coordinate bonds formed is 3 2 = 6. Therefore, the coordination number of the central metal ion is 6. Answer: 6
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