A) \[C{{u}_{2}}C{{l}_{2}}\,\]and \[{{[NiC{{l}_{4}}]}^{2-}}\]
B) \[{{[Ti{{F}_{6}}]}^{2-}}\] and \[C{{u}_{2}}C{{l}_{2}}\,\]
C) \[{{[Co{{F}_{6}}]}^{3-}}\] and \[{{[NiC{{l}_{4}}]}^{2-}}\]
D) \[{{[Ti{{F}_{6}}]}^{2-}}\] and \[{{[Co{{F}_{6}}]}^{3-}}\]
Correct Answer: B
Solution :
[b] The colour exhibited by transition metal ions is due to the presence of unpaired electrons in d-orbitals which permits the d - d excitation of electrons. In \[{{[Ti{{F}_{6}}]}^{2-}}-Ti\] is in + 4 O.S.; \[3{{d}^{0}}\]-colourless In \[{{[Co{{F}_{6}}]}^{3-}}\] -Co is in +3 O.S; \[3{{d}^{5}}\]-coloured In \[C{{u}_{2}}C{{l}_{2}}\]-Cu is in + 1 O.S.; \[3{{d}^{10}}\]- colourless In \[{{\left[ NiC{{l}_{4}} \right]}^{2-}}\]-Ni is in + 2 O.S; \[3{{d}^{8}}\]-coloured
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