A) vacant d-orbitals
B) unpaired electrons in d orbitals
C) completely filled d-orbitals
D) None of these
Correct Answer: A
Solution :
Transitional metal ions having completely filled or empty d-orbitals, ie, \[(n-1){{d}^{10}}\]or \[(n-1){{d}^{0}}\] configuration are colourless while transitional metal ions having \[(n-1){{d}^{1-9}}\]configuration are coloured due to d - d transition. \[Ti(22)\,\,:\,\,[Ar]\,\,3{{d}^{2}}A{{s}^{2}}\] \[T{{i}^{3+}}:[Ar]\,\,3{{d}^{1}}4{{s}^{o}}:\] purple \[T{{i}^{4+}}:[Ar]\,\,3{{d}^{0}}4{{s}^{o}}:\] colourless Hence, \[T{{i}^{4+}}\] metal ion is colourless due to vacant d-orbitals.
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