| The d-electron configurations of \[C{{r}^{2+}},M{{n}^{2+}},\] \[F{{e}^{2+}}\] and \[C{{o}^{2+}}\] are \[{{d}^{4}},{{d}^{5}},{{d}^{6}}\] and \[{{d}^{7}}\] respectively.[AIPMT (S) 2011] |
| Which one of the following will exhibit minimum paramagnetic behaviour? |
| (At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27) |
A) \[{{[Fe{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
B) \[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
C) \[{{[Cr{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
D) \[{{[Mn{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
Correct Answer: B
Solution :
[b]  |
 |
  |
| \[\therefore \]\[{{[Co{{({{H}_{2}}O)}_{6}}]}^{2+}}\]has minimum number of unpaired electrons and thus, minimum paramagnetic behavior. |
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