JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
Consider the metal complexes \([Ni(en)_3]^{2+}\) (A), \([NiCl_4]^{2-}\) (B) and \([Ni(NH_3)_6]^{2+}\) (C). Choose the CORRECT option by considering the number of unpaired electrons present in (A), (B) and (C) respectively and the order of frequency of absorption.
- A \(2, 2, 2\) and \((A)>(C)>(B)\)
- B \(0, 2, 0\) and \((A)>(C)>(B)\)
- C \(2, 2, 0\) and \((B)>(C)>(A)\)
- D \(2, 2, 2\) and \((C)>(A)>(B)\)
Answer & Solution
Correct Answer
(A) \(2, 2, 2\) and \((A)>(C)>(B)\)
Step-by-step Solution
Detailed explanation
The oxidation state of \(Ni\) in all three complexes is \(+2\). The electronic configuration of \(Ni^{2+}\) is \([Ar] 3d^{8}\). In \([Ni(en)_3]^{2+}\) (A), the coordination number is \(6\) (octahedral geometry). The \(d^{8}\) configuration in an octahedral field is…
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