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 :
| [d] \[\text{CrO}_{4}^{2-}\Rightarrow C{{r}^{6+}}=[Ar]\] |
| 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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