A) \[FeC{{l}_{2}}\] and \[MnC{{l}_{2}}\]
B) \[VOC{{l}_{2}}\] and \[CuC{{l}_{2}}\]
C) \[FeC{{l}_{3}}\] and \[CuC{{l}_{2}}\]
D) \[VOC{{l}_{2}}\] and \[FeC{{l}_{2}}\]
Correct Answer: B
Solution :
Colour of transition metal ion salt is due to d-d transition of unpaired electrons of d-orbital. 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 as \[{{V}^{4+}}\] and in \[CuC{{l}_{2}},\] copper is present as \[C{{u}^{2+}}.\] \[{{V}^{4+}}:\,1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{1}}:1\] unpaired \[{{e}^{-}}\] \[C{{u}^{2+}}:\,1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}3{{d}^{9}}:1\] unpaired \[{{e}^{-}}\]
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