The colour of $K_{2} C r_{2} O_{7}$ and $F e^{2 +}$ ions are respectively due to:

d - d transition and charge transfer spectra

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charge transfer spectra and d-d transition

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crystal defects and charge transfer spectra

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charge transfer spectra and crystal defects

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Solution

The correct option is B charge transfer spectra and d-d transition
$K_{2} C r_{2} O_{7}$ , shows colour due to a charge transfer because the oxidation state of $C r$ is +6, so there are no d-electrons which can be excited. Therefore, the colour is due to charge transfer. Here, ligand to metal charge transfer (LMCT) occurs.

$F e^{+ 2}$ has 6 d-electrons, so the colour is due to d-d transitions.

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