A) \[\text{MnO}_{\text{4}}^{\text{-}}\]
B) \[\text{C}{{\text{r}}_{\text{2}}}\text{O}_{\text{7}}^{\text{2-}}\]
C) \[\text{CrO}_{4}^{\text{2-}}\]
D) \[\text{MnO}_{\text{4}}^{\text{2-}}\]
Correct Answer: D
Solution :
\[\text{CrO}_{4}^{2-}\Rightarrow C{{r}^{6+}}=[Ar]\] Unpaired electron \[\text{(n)=0;}\] Diamagnetic \[\text{C}{{\text{r}}_{2}}O_{7}^{2-}\Rightarrow C{{r}^{6+}}=[Ar]\] Unpaired electron \[\text{(n)=0}\]; Diamagnetic \[\text{MnO}_{4}^{2-}=M{{n}^{6+}}=[Ar]3{{d}^{1}}\] Unpaired electron \[(n)=1\]; Paramagnetic \[MnO_{4}^{-}=M{{n}^{7+}}=[Ar]\] Unpaired electron \[(n)\text{ }=\text{ }0;\] Diamagnetic
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