Coordination Compounds Ques 40
40. Which of these statements about $[Co(CN)_6]^{3-}$ is true?
[2015]
(a) $[Co(CN)_6]^{3-}$ has four unpaired electrons and will be in a low-spin configuration.
(b) $[Co(CN)_6]^{3-}$ has four unpaired electrons and will be in a high spin configuration.
(c) $[Co(CN)_6]^{3-}$ has no unpaired electrons and will be in a high-spin configuration.
(d) $[Co(CN)_6]^{3-}$ has no unpaired electrons and will be in a low-spin configuration.
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Answer:
Correct Answer: 40.(d)
Solution:
(d) $In[Co(CN)_6]^{-3}$, O.N. of Co is +3
$\therefore Co^{+3}=3 d^{6} 4 s^{0}$
$CN^{-}$is a strong field ligand
$\therefore \quad$ Pairing of electrons occurs so in this complex no unpaired electron is present and it is low spin complex.
BETA
