${[Ti {(H_{2} O)}_{6}]}^{3 +}$ ion exhibit colour due to

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absence of unpaired electrons in 'd' orbitals

charge transfer phenomenon

d-d electron transition

close packing crystal structure

answer is C.

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Detailed Solution

₂₂Ti [₁₈Ar]4s²3d²

₂₂Ti⁺³ [₁₈Ar]4s⁰3d¹

It exists as Ti^3+, which has one unpaired electron in the 3d orbital, in the [Ti(H₂O)₆]³⁺ complex. As a result, only Ti(H₂O)₆³⁺ is capable of the d-d transition.

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