NEETChemistryCoordination Compounds
Why is [Cr(NH 3 ) 6 ] 3+ paramagnetic while [Ni(CN) 4 ] 2– is diamagnetic?
Options
- A[Cr(NH 3 ) 6 ] 3+ has unpaired electrons due to the presence of a weak ligand like NH 3 , while [Ni(CN) 4 ] 2–
- B[Cr(NH 3 ) 6 ] 3+ has a higher oxidation state than [Ni(CN) 4 ] 2– , resulting in paramagnetism.
- C[Cr(NH 3 ) 6 ] 3+ has a larger coordination number than [Ni(CN) 4 ] 2– , leading to paramagnetism.
- D[Cr(NH 3 ) 6 ] 3+ and [Ni(CN) 4 ] 2– both have unpaired electrons, so they are both paramagnetic.
Correct answer
A. [Cr(NH 3 ) 6 ] 3+ has unpaired electrons due to the presence of a weak ligand like NH 3 , while [Ni(CN) 4 ] 2–
Step-by-step solution
Correct Option is : (A) [Cr(NH 3 ) 6 ] 3+ has unpaired electrons due to the presence of a weak ligand like NH 3 , while [Ni(CN) 4 ] 2– has a very strong ligand like CN, so exhibits diamagnetism.