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JEE Main Chemistry question

ChemistryThe d and f-Block ElementsJEE Main

How many of the following pairs have approximately equal radii? (Zr,Hf);\ (Nb,Ta);\ (Cr,Mn);\ (Mn,Fe);\ (Nb^{3+},Ta^{3+})

Answer: 3

Solution

and are classic pairs made nearly identical in size by the lanthanide contraction (Hf and Ta lie just after the lanthanides), and this persists for their ions, .

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Question ID VK-147514