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JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry

दिये गये निम्न-प्रचक्रण संकरों \(\left[ V ( CN )_{6}\right]^{4-}\), \(\left[ Fe ( CN )_{6}\right]^{4-},\left[ Ru \left( NH _{3}\right)_{6}\right]^{3+}\) तथा \(\left[ Cr \left( NH _{3}\right)_{6}\right]^{2+}\) में धातु आयनों के प्रचक्रण मात्र चुम्बकीय आघूर्णों का सही क्रम है

  1. A \(C{r^{2 + }} > R{u^{3 + }} > F{e^{2 + }} > {V^{2 + }}\)
  2. B \({V^{2 + }} > C{r^{2 + }} > R{u^{3 + }} > F{e^{2 + }}\)
  3. C \(C{r^{2 + }} > {V^{2 + }} > R{u^{3 + }} > F{e^{2 + }}\)
  4. D \({V^{2 + }} > R{u^{3 + }} > C{r^{2 + }} > F{e^{2 + }}\)
Verified Solution

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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