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  4. In following pairs, the one in which both transition metal ions are colourless is :

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Q. In following pairs, the one in which both transition metal ions are colourless is :

JEE MainJEE Main 2022The d-and f-Block Elements

Solution:

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No $d - d$ transitions in ions with $d ^{\circ} \,\&\, d ^{10}$ configuration. Therefore they are colourless.