Question

$T{i}^{3+}$ is purple, but $T{i}^{4+}$ is colourless. This is because:

• A. $d^1$ configuration of $T{i}^{3+}$ and $d^0$ configuration of
  $T{i}^{4+}$
• B. $d^1$ configuration of $T{i}^{3+}$ and $d^{10}$ configuration of
  $T{i}^{4+}$
• C. $d^0$ configurationof $T{i}^{3+}$ and $d^1$ configuration of
  $T{i}^{4+}$
• D. $d^{10}$ configuration of $T{i}^{3+}$ and $d^1$ configuration of
  $T{i}^{4+}$

Answer 1

The correct option is A $d^1$ configuration of $T{i}^{3+}$ and $d^0$ configuration of

$T{i}^{4+}$
Any elements or ion shows colour due to presence of unpaired electron in their configuration. As $T{i}^{+3}$ has electronic configuration $d^1$ so it shows colour but $T{i}^{4+}$ ion does not show colour due to absence of unpaired electrons.