Which one of the following ions exhibits transition and paramagnetism as well? [2018]

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Solution

Q.
Which one of the following ions exhibits $d - d$ transition and paramagnetism as well [2018]

1 ${CrO}_{4}^{2 -}$

2 ${Cr}_{2} O_{7}^{2 -}$

3 ${MnO}_{4}^{-}$

4 ${MnO}_{4}^{2 -}$

Ans.
(4)

In ${CrO}_{4}^{2 -}$ , ${Cr}^{6 +} (n = 0)$ diamagnetic
In ${Cr}_{2} O_{7}^{2 -}$ , ${Cr}^{6 +} (n = 0)$ diamagnetic
In ${MnO}_{4}^{-}$ , ${Mn}^{7 +} (n = 0)$ diamagnetic
In ${MnO}_{4}^{2 -}$ , ${Mn}^{6 +} (n = 1)$ paramagnetic
In ${MnO}_{4}^{2 -}$ , one unpaired electron ( $n$ ) is present in $d$ -orbital so, $d - d$ transition is possible.

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