Question
$\ce{Ti^{3+}(aq)}$ is violet while $\ce{Ti^{4+}(aq)}$ is colourless because $−$
✓
Answer
$\ce{Ti^{+3}: d^1}$ configuration have one unpaired $d -$ electron so it is colourful but
$\ce{Ti^{+4}: d^0}$ configuration have zero unpaired $d -$ electron so it is colourless.
$\ce{Ti^{+4}: d^0}$ configuration have zero unpaired $d -$ electron so it is colourless.
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