JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry
Which one of the following complexes will exhibit the least paramagnetic behaviour ? [Atomic number, \(\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27\) ]
- A \(\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
- B \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
- C \(\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
- D \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
Answer & Solution
Correct Answer
(A) \(\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
Step-by-step Solution
Detailed explanation
Number of unpaired \(\mathrm{e}^{-}\) \(\mu=\sqrt{n(n+2)}\) \(B.M.\) \(\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) \(3\) \(3.87\) \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\) \(4\) \(4.89\)…
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