Question
Question: Which one of the ionic species will impart colour to an aqueous solution?...
Which one of the ionic species will impart colour to an aqueous solution?
A
Ti4+
B
Cu+
C
Zn2+
D
Cr3+
Answer
Cr3+
Explanation
Solution
In Ti4+, Cu+ and Zn2+, all have electrons paired so all are diamagnetic. Cr3+ with electron configuration [Ar]18 3d3 has three unpaired electrons. So it undergoes d-d transition of electrons in presence of ligands according to CFT and thus it is coloured.