${CrO}_{4}^{2 -} and {MnO}_{4}^{-}$ ions exhibit colour due to

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close packing crystal structure

charge transfer phenomenon

presence of unpaired electrons in 'd' orbtials of Cr and Mn

d-d electron transition

answer is B.

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Detailed Solution

In CrO₄²⁻, Cr is in +6 oxidation state and has d⁰ configuration and MnO₄^- ,Mn is in +7oxidation state and has d⁰ configuration .The color is due to charge transfer and not due to d - d transition.

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