Question

The metal ion which is NOT coloured, is
a) Fe³⁺
b) V²⁺
c) Zn²⁺
d) Ti³⁺

Answer 1

Hola mate !! ✌️✌️

here's your answer ...⬇️⬇️

Zn2+ is not coloured

▶️so your answer is C.

➡️this is so because this ion has d10 configuration, that is, its d orbital is fully filled. hence due to extra stability its electron are not excited . hence , it is not coloured.

hope it helps !! ❤️❤️

Answer 2

The correct option is c.

• The metal ion which shows electronic transition shows intense colour.
• The valance shell electronic configuration of $Fe^{+3}$ is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {3d}^{5}$
• Thus it is stable but shows electronic transition and give colour.
• The valance shell electronic configuration of $V^{+2}$ is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {3d}^{3}$
• It has unpaired electrons in 3d orbital so, it shows electronic transition and gives colour.
• The valance shell electronic configuration of $Zn^{+2}$ is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {3d}^{10}$
• Thus it has filled d orbital and no unpaired electron. So, it does not undergo electronic transition and remains colourless.
• The valance shell electronic configuration of $Ti^{+3}$ is-
• ${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {3d}^{1}$
• It has unpaired electrons in 3d orbital so, it shows electronic transition and gives colour.