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In which of the following ions, the colour is not due to d-d transition ?
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- [Ti(H2O)6]3+
- CoF63–
- MnO–4
- [Cu(NH3)4]2+
- [Ti(H2O)6]3+
Correct Option: C
The colour of transition-metal compounds is normally associated with d-d transitions. However, some transition metal compounds show intense colour in solution in spite of absence of d-electrons. For example, the orange colour of TiBr4, yellow colour of CrO42– , orange colour of Cr2O2–7, intense red colour of [Fe(SCN)4] and deep purple of MnO4 are not due to d—d transitions. In the case of MnO4 ion, the color is due to charge transfer and not due to d-d transitions.
