Which of these statements about [ C o ( C N ) 6 ] 3 - is true

Question

Which of these statements about [ C o ( C N ) 6 ] 3 - is true, [ C o ( C N ) 6 ] 3 - has four unpaired electrons and will be in a low-spin configuration., [ C o ( C N ) 6 ] 3 - has four unpaired electrons and will be in a high-spin configuration., [ C o ( C N ) 6 ] 3 - has no unpaired electrons and will be in a high-spin configuration., [ C o ( C N ) 6 ] 3 - has no unpaired electrons and will be in a low-spin configuration.

MARKS App · Accepted Answer

In [ C o ( C N ) 6 ] 3 - Cobalt is in + 3 oxidation state so C o + 3 = ( A r ) 3 d 6 4 s 0 4 p 0 As in presence of strong field ligand, pairing of electrons occurs so in this complex no unpaired electron is present and it is a low-spin complex.

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