A) \[[Cr\,{{({{H}_{2}}O)}_{6}}^{2+}\text{and }\!\![\!\!\text{ }Fe\,{{\text{(}{{H}_{2}}O)}_{6}}{{]}^{2+}}\]
B) \[{{[Mn\,{{({{H}_{2}}O\text{)}}_{6}}\text{ }\!\!]\!\!\text{ }}^{2+}}\text{and }\!\![\!\!\text{ }Fe\,{{\text{(}{{H}_{2}}O)}_{6}}{{]}^{2+}}\]
C) \[{{[CoC{{l}_{4}}]}^{2-}}\text{and}\,{{[Fe\,{{({{H}_{2}}O)}_{6}}]}^{2+}}\]
D) \[{{[Cr\,{{({{H}_{2}}O)}_{6}}]}^{2+}}\text{and}\,{{\text{ }\!\![\!\!\text{ }CoC{{l}_{4}}]}^{2-}}\]
Correct Answer: A
Solution :
[a] The complexes that has same number of unpaired electrons will have same magnetic moment. The number of unpaired electrons in complexes are as follows:Complex | Electronic configuration of metal ion | Number of unpaired electrons (n) |
\[{{[Cr\,{{({{H}_{2}}O)}_{6}}]}^{2+}}\] | \[C{{r}^{2+}};[Ar]\,3{{d}^{4}}\] | |
\[{{[Fe\,{{({{H}_{2}}O)}_{6}}]}^{2+}}\] | \[F{{e}^{2+}};[Ar]\,3{{d}^{6}}\] | |
\[{{[Mn\,{{({{H}_{2}}O)}_{6}}]}^{2+}}\] | \[M{{n}^{2+}};[Ar]\,3{{d}^{5}}\] | |
\[{{[CoCl]}^{2-}}\] | \[C{{o}^{2+}};[Ar]3{{d}^{7}}\] |
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