KCET · Chemistry · d and f Block Elements
In the following pairs, the one in which both transition metal ions are colourless is
- A \(\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}\)
- B \(\mathrm{V}^{2+}, \mathrm{Ti}^{3+}\)
- C \(\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}\)
- D \(\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}\)
Step-by-step Solution
Detailed explanation
Ions with \(\mathrm{d}^{\circ}\) and \(\mathrm{d}^{10}\) donot show d.d transitions, hence colorless
\[
\begin{aligned}
& \mathrm{Sc}^{+3}-[\mathrm{Ar}] 3 \mathrm{~d}^{\circ} 4s^{\circ} \\
& \mathrm{Zn}^{+2}-[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4s^{\circ}
\end{aligned}
\]
\[
\begin{aligned}
& \mathrm{Sc}^{+3}-[\mathrm{Ar}] 3 \mathrm{~d}^{\circ} 4s^{\circ} \\
& \mathrm{Zn}^{+2}-[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4s^{\circ}
\end{aligned}
\]
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