JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The calculated spin only magnetic moments \((BM)\) of the anionic and cationic species of \({\left[ {Fe{{\left( {{H_2}O} \right)}_6}} \right]_2}\) and \(\left[ {Fe{{\left( {CN} \right)}_6}} \right]\) , respectively, are:
- A \(0\) and \(5.92\)
- B \(2.84\) and \(5.92\)
- C \(4.9\) and \(0\)
- D \(0\) and \(4.9\)
Answer & Solution
Correct Answer
(C) \(4.9\) and \(0\)
Step-by-step Solution
Detailed explanation
\({[Fe{(CN)_6}]^{4 - }}\) \({[Fe{({H_2}O)_6}]^{2 + }}\) \(F{e^{2 + }}\, \to \,3{d^6}\) \(F{e^{2 + }}\, \to \,3{d^6}\) \(t_{2g}^6\,e{g^0}\) \(t_{2g}^4\,e{g^2}\) \(\mu \, = \,\sqrt {n(n + 2)} \) \(\mu \, = \,\sqrt {n(n + 2)} \,=\,\sqrt {24}\) \(\mu \, =0\) \(\mu \, = \,4.9\,BM\)
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