Question
Which of the following statements is correct with respect to [ Mn(CN) _6]^ 3- ?
MHT CET
Chemistry
Coordination Compounds
2026
MHT CET 2026 (13 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. It is sp^3 d^2 hybridised and tetrahedral.
- B. It is d^2 sp^3 hybridised and octahedral.
- C. It is dsp^2 hybridised and square planar
- D. It is sp^3 d^2 hybridised and octahedral.
Answer
B. It is d^2 sp^3 hybridised and octahedral.
Step-by-step solution
The given complex is [ Mn(CN) _6]^ 3- . Let the oxidation state of Mn be x. x + 6(-1) = -3 x = +3 The electronic configuration of Mn is [ Ar ] 3d^5 4s^2. The electronic configuration of Mn ^ 3+ is [ Ar ] 3d^4. Since CN ^- is a strong field ligand, it causes pairing of electrons in the 3d orbitals against Hund's rule. The four electrons occupy the t_ 2g orbitals, leaving two e_g orbitals empty. These two empty 3d orbitals, along with one 4s and three 4p orbitals, undergo d^2sp^3 hybridization. The geometry corresponding to d^2sp^3 hybridization is octahedral. Answer: It is d^2 sp^3 hybridised and octahedral.
Related: Chemistry — Coordination Compounds · All PYQ Banks