A) \[CoF_{6}^{3-}\]and \[NiCl_{4}^{2-}\]
B) \[TiF_{6}^{2-}\]and \[CoF_{6}^{3-}\]
C) \[C{{u}_{2}}C{{l}_{2}}\] and \[NiCl_{4}^{2-}\]
D) \[TiF_{6}^{2-}\] and \[C{{u}_{2}}C{{l}_{2}}\]
Correct Answer: D
Solution :
Transitional metals ions having unpaired electrons are coloured while those which have no unpaired electron are colourless. \[Ti{{F}_{6}}^{2-}:\] \[T{{i}^{4+}}:[Ar]\,3{{d}^{0}};0\]unpaired electron; colourless \[C{{u}_{2}}C{{l}_{2}}\] \[C{{u}^{+}}:[Ar]\,\,3{{d}^{10}};0\]unpaired electron; colourless \[Co{{F}_{6}}^{3-}:\] \[C{{o}^{3+}}:[Ar]\,3{{d}^{6}};4\]unpaired electrons; coloured \[NiCl_{4}^{2-}\] \[N{{i}^{2+}}:[Ar]\,3{{d}^{8}};2\]unpaired electrons; coloured
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