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In which of the following ions , the colour is not due to d-d transition ? |
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Answer» [CrO4]2 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 Cr2O27-, 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. |
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