Question

The compounds of \( \text{Ti}^{4+} \) ions are colourless due to ___________.

Hint:

Compounds of transition metal ions that lack d-electrons, such as \( \text{Ti}^{4+} \), do not undergo d-d transitions, which is why they are typically colorless.

Answer 1

Titanium in its \( \text{Ti}^{4+} \) oxidation state has an electronic configuration equivalent to \( [\text{Ar}] \), devoid of d-electrons. In transition metals, color typically originates from d-d electron transitions. However, the lack of d-electrons in \( \text{Ti}^{4+} \) means that these transitions are absent, resulting in colorless compounds.