SELECT * FROM question_mgmt as q WHERE id=1945 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=64 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 12th chemistry Coordination Compounds cr nh3 6 3 is paramagnetic while ni cn 4 2 is

Question:

[Cr(NH3)6]3+ is paramagnetic while [Ni(CN)4]2- is diamagnetic.  Explain why?

Answer:

Cr is in the +3 oxidation state i.e., d3 configuration. Also, NH3 is a weak field ligand that does not cause the pairing of the electrons in the 3d orbital.

Cr3+

Therefore, it undergoes d2sp3 hybridization and the electrons in the 3d orbitals remain unpaired. Hence, it is paramagnetic in nature.

In [Ni(CN)4]2-, Ni exists in the +2 oxidation state i.e., d8 configuration.

 

Ni2+:

 

CN- is a strong field ligand. It causes the pairing of the 3d orbital electrons. Then, Ni2+ undergoes dsp2 hybridization.

As there are no unpaired electrons, it is diamagnetic.


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