A) \[{{V}^{2+}}<C{{r}^{2+}}<M{{n}^{2+}}<F{{e}^{2+}}:\] paramagnetic behavior
B) \[N{{i}^{2+}}<C{{o}^{2+}}<F{{e}^{2+}}<M{{n}^{2+}}:\]Ionic size
C) \[C{{o}^{3+}}<F{{e}^{3+}}<C{{r}^{3+}}<S{{c}^{3+}}:\]Stability in aqueous solution
D) \[Sc<Ti<Cr=Mn:\]Number of oxidation states
Correct Answer: A
Solution :
| \[V=3{{d}^{3}}4{{s}^{2}}{{V}^{2+}}=3{{d}^{3}}\,\,\,=\,\,\,3\] |
| Unpaired electron |
| \[Cr=3{{d}^{5}}4{{s}^{1}}C{{r}^{2+}}=3{{d}^{4}}\,\,=\,\,\,4\] |
| Unpaired electron |
| \[Mn=3{{d}^{5}}4{{s}^{2}}M{{n}^{2+}}=3{{d}^{5}}\,\,\,=\,\,\,5\] |
| Unpaired electron |
| \[Fe=3{{d}^{6}}4{{s}^{2}}F{{e}^{2+}}=3{{d}^{5}}\,\,\,=\,\,\,4\] |
| Unpaired electron |
| Hence the correct order of paramagnetic behaviour \[{{V}^{2+}}<C{{r}^{2+}}=F{{e}^{2+}}<M{{n}^{2+}}\] |
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