Which of the following salts is colourless?

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(B) $KMnO_4$ is a purple-coloured salt due to charge transfer.$BaSO_4$ is a white (colourless) salt as $Ba^{2+}$ and $SO_4^{2-}$ ions have a $d^0$ con

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$BaSO_4$

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(B) $KMnO_4$ is a purple-coloured salt due to charge transfer.$BaSO_4$ is a white (colourless) salt as $Ba^{2+}$ and $SO_4^{2-}$ ions have a $d^0$ configuration and no $d-d$ transitions occur.$Na_2CrO_4$ is yellow due to charge transfer in the chromate ion.$CoCl_2$ is blue (in anhydrous form) or pink (in hydrated form) due to $d-d$ transitions.

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