Which group contains coloured ions out of
$\begin{array}{llll}1 . & \mathrm{Cu}^{2+} & 2 . & \mathrm{Ti}^{4+}\end{array}$
$\begin{array}{llll}3 . & \mathrm{Co}^{2+} & 4 . & \mathrm{Fe}^{2+}\end{array}$

Question

Aicharya · Accepted Answer

(b) $\mathrm{Cu}^{2+}[\mathrm{Ar}] 3 d^{9}, \mathrm{Ti}^{4+}[\mathrm{Ar}] 3 d^{0}, \mathrm{Co}^{2+}[\mathrm{Ar}] 3 d^{7}$
$\mathrm{Fe}^{2+}[\mathrm{Ar}] 3 d^{6} 1,3,4$ are coloured ions
hence the answer is $\mathrm{b}$.

Which group contains coloured ions out of $\begin{array}{llll}1 . & \mathrm{Cu}^{2+} & 2 . &…

Solution