JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The spin-only magnetic moment value for the complex \(\left[\mathrm{Co}\left(\mathrm{CN}_{6}\right)\right]^{4-}\) is \(......\,BM\) [At. no. of \(\mathrm{Co}=27\) ]
- A \(1\)
- B \(2\)
- C \(3\)
- D \(5\)
Answer & Solution
Correct Answer
(B) \(2\)
Step-by-step Solution
Detailed explanation
\({\left[\mathrm{CO}(\mathrm{CN})_{6}\right]^{4-}}\) \(\mathrm{x}+6 \times(-1)=-4\) \(\mathrm{x}=+2\) \(\mathrm{Co}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{7}\) and \(\mathrm{CN}^{-}\)is a strong field ligand which can pair electron of central atom. It has one unpaired electron (…
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