Question : In which of the following ions, the colour is not due to d-d transition?
Option 1: [Ti(H2O)6]+3
Option 2: CoF63−
Option 3: MnO4−
Option 4: [Cu(NH3)4]2+
Correct Answer: MnO 4 −
Solution : The correct option is MnO 4 − .
The polyatomic ion MnO 4 − has a tetrahedral shape, a dark purple hue, and is composed of manganese and oxygen. Due to the Mn atom's +7 oxidation state and d orbital configuration, there are no unpaired electrons in the d orbitals of the MnO 4 − ion. The charge shift that takes place when an electron is moved from the oxygen atoms to the Mn atom gives the MnO 4 − ion its purple colour.
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