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) \[TiFl_{6}^{2-}\]and\[C{{u}_{2}}C{{l}_{2}}\]
Correct Answer: D
Solution :
Transitional metals ions having unpaired electrons are coloured while those which have not unpaired electrons are colorless. \[TiF_{6}^{2-}:\] \[T{{i}^{4+}}:[Ar]3{{d}^{0}};0\]unpaired electron; colorless \[C{{u}_{2}}C{{l}_{2}}\] \[C{{u}^{+}}:[Ar]\,3{{d}^{10}};0\]unpaired electron; colourless \[CoF_{6}^{3-}:\] \[C{{0}^{3+}}:[Ar]\,3{{d}^{6}};4\]unpaired electron; coloured \[NiCl_{4}^{2-}\] \[N{{i}^{2+}}:[Ar]3{{d}^{8}};2\]unpaired electrons; coloured
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