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Q.
Which of the following compounds are expected to show similar colour in aqueous medium? (1) $ FeC{{l}_{2}} $ (2) $ VOC{{l}_{2}} $ (3) $ MnC{{l}_{2}} $ (4) $ CuC{{l}_{2}} $
BHUBHU 2011
Solution:
Metal ion salt having similar number of unpaired electrons in d-orbitals show similar colour in aqueous medium. In $ VOC{{l}_{2}}, $ vanadium is present in $ {{V}^{4+}} $ and in $ CuC{{l}_{2}} $ copper is present as $ C{{u}^{2+}} $
$ {{V}^{4+}}:1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},\text{ }3{{s}^{2}}3{{p}^{6}},\text{ }3{{d}^{1}}; $ one unpaired
$ {{e}^{-}} $ $ C{{u}^{2+}}:1{{s}^{2}},2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{9}}; $
one unpaired $ {{e}^{-}} $
Hence, $ VOC{{l}_{2}} $ and $ CuC{{l}_{2}} $ show similar colour.