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JEE Advanced Chemistry question

ChemistryThe d and f-Block ElementsJEE Advanced

How many of the following pairs have approximately equal radii? (Zr, Hf), (Nb, Ta), (Cr, Mn), (Mn, Fe), (, ), (, )

Answer: 4

Solution

As in Q716, the four lanthanide-contraction pairs — (Zr, Hf), (Nb, Ta), (, ) and (, ) — have genuinely

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Question ID VK-159964