Question
What is the oxidation state of cobalt in [ Co ( NH _3)_6]^ 3+ ?
MHT CET
Chemistry
Coordination Compounds
2026
MHT CET 2026 (19 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. +5
- B. +4
- C. +3
- D. +2
Answer
C. +3
Step-by-step solution
Let the oxidation state of cobalt be x. Ammonia ( NH _3) is a neutral ligand, so its charge is 0. The sum of the oxidation states of all atoms in the complex ion is equal to the net charge on the ion. x + 6(0) = +3 x = +3 The oxidation state of cobalt in [ Co ( NH _3)_6]^ 3+ is +3. Answer: +3
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