Which of the following will have a spin-only magnetic moment of 2.86 BM?
Show Hint
- \(\text{[CoF}_6]^{3-}\)
- \(\text{[Co(NH}_3)_6]^{3+}\)
- \(\text{[NiCl}_4]^{2-}\)
- \(\text{[Ni(CN)}_4]^{2-}\)
The Correct Option is C
Solution and Explanation
Step 1: Determine the Magnetic Moment - The magnetic moment (\(\mu\)) for a transition metal complex can be calculated using the formula: \[ \mu = \sqrt{n(n+2)} \, \text{BM}, \] where \(n\) is the number of unpaired electrons.
Step 2: Analyze the Complexes - \(\text{[NiCl}_4]^{2-}\): Nickel in the +2 oxidation state (\(d^8\)) has 2 unpaired electrons, which gives a spin-only magnetic moment of 2.86 BM. Hence, the correct answer is \(\text{[NiCl}_4]^{2-}\).
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