Coordination Compounds Ques 57
57. The $d$-electron configurations of $\mathrm{Cr}^{2+}, \mathrm{Mn}^{2+}$, $\mathrm{Fe}^{2+}$ and $\mathrm{Co}^{2+}$ are $d^4, d^5, d^6$ and $d^7$, respectively. Which one of the following will exhibit minimum paramagnetic behaviour?
[2011]
(a) $\left[\mathrm{Mn}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
(b) $\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
(c) $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
(d) $\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}$
(At, nos. $\mathrm{Cr}=24, \mathrm{Mn}=25, \mathrm{Fe}=26, \mathrm{Co}=27$ )
Show Answer
Answer:
Correct Answer: 57.(c)
Solution: (c)
Minimum paramagnetic behaviour
$ =\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+} $
BETA
