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  1. In which of the following ions , the colour is not due to d-d transition ?

    2. A.

     [Ti(H2O)6]3+
    B.

     [CoF6]3+
    C.

     [CrO4]2−
    D.

     [Cu(NH3)4]2+

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    Answer : Option C

    Explanation :

    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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