Ti³⁺ is purple but Ti⁴⁺ is colourless. This is because

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d¹ configuration of Ti³⁺

d⁰ configuration of Ti³⁺

d¹⁰ configuration of Ti³⁺

d³ configuration of Ti³⁺

answer is A.

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Detailed Solution

Any elements or ion shows colour due to presence of unpaired electron in their configuration. As Ti⁺³ has electronic configuration d¹ so it shows colour but Ti⁴⁺ ion does not show colour due to absence of unpaired electrons.

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