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Q.

The electronic configuration of central metal atom/ion in [Co(CN)6]3– is

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a

t25ego

b

t24eg2

c

t24eg3

d

t2g6eg0

answer is D.

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Detailed Solution

 Co+3 ion is present in [Co(CN)6​]−3.
While in the excited state, and undergoing hybridization, CN− being a strong field ligand forces the inner d electrons to pair up.
 Co+3 in [Co(CN)6​]−3 has no unpaired electron(i.e. it is diamagnetic).

d6 configuration with strong field ligand t2g6eg0

Explain why a knowledge of magnetic suceptilbility of a complex is often necessary for a correct assignment of the electronic conifiguration according - Sarthaks eConnect | Largest Online Education Community
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