JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
The correct order of the spin only magnetic moment of metal ions in the following low spin complexes, \({\left[ {V\,{{\left( {CN} \right)}_6}} \right]^{4 - }}\) , \({\left[ {Fe\,{{\left( {CN} \right)}_6}} \right]^{4 - }}\) , \({\left[ {Ru\,{{\left( {N{H_3}} \right)}_6}} \right]^{3 + }}\) , and \({\left[ {Cr\,{{\left( {N{H_3}} \right)}_6}} \right]^{2 + }}\) , is
- A \(C{r^{2 + }} > R{u^{3 + }} > F{e^{2 + }} > {V^{2 + }}\)
- B \({V^{2 + }} > C{r^{2 + }} > R{u^{3 + }} > F{e^{2 + }}\)
- C \(C{r^{2 + }} > {V^{2 + }} > R{u^{3 + }} > F{e^{2 + }}\)
- D \({V^{2 + }} > R{u^{3 + }} > C{r^{2 + }} > F{e^{2 + }}\)
Answer & Solution
Correct Answer
(B) \({V^{2 + }} > C{r^{2 + }} > R{u^{3 + }} > F{e^{2 + }}\)
Step-by-step Solution
Detailed explanation
Since \(CN^-\) and \(NH_3\) are strong field ligands, low spin complexes are formed. Complex Configuration No. of unpaired electrons \([V(CN)_6]^{4-}\) \(t_{2g}^3\,e_g^0\) \(3\) \({[Cr{(N{H_3})_6}]^{2 + }}\) \(t_{2g}^4\,e_g^0\) \(2\) \({[Ru{(N{H_3})_6}]^{3 + }}\)…
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