How many among the following ions are expected to be coloured? $C u^{+}, F e^{2 +}, M n^{2 +}, C r^{3 +}, S c^{3 +}, T i^{4 +}$

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Solution

The correct option is C 3
Colour arises from the electronic transition of unpaired electrons. Electrons abosrb energy and get excited to a higher energy level, when they get de-excited, they radiate energy in a certain wavelength which is responsible for the colour.
Electronic configuration of ions:
$C u^{+} : [A r] 3 d^{10}$
$F e^{2 +} : [A r] 3 d^{6}$
$M n^{2 +} : [A r] 3 d^{5}$
$C r^{3 +} : [A r] 3 d^{3}$
$S c^{3 +} : [A r] 3 d^{0}$
$T i^{4 +} : [A r] 3 d^{0}$
$C u^{+}$ , $S c^{3 +}$ and $T i^{4 +}$ do not have any unpaired electrons and hence they do not exhibit colour.

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