MHT CET Chemistry question

Select the correct order of sizes for the following d-block elements.

(A)Correct
(B)\mathrm{Zr^{4+} < Zr,\ Nb^{3+} < Ta^{3+},\ Fe^{3+} < Fe^{2+} < Fe}
(C)\mathrm{Zr^{4+} = Hf^{4+},\ Nb^{3+} = Ta^{3+},\ Fe < Co < Ni}
(D)\mathrm{Zr^{4+} < Hf^{4+},\ Nb^{3+} = Ta^{3+},\ Ni < Cu < Co}

Answer: (A)

Solution

Lanthanoid contraction makes the 5d elements almost as small as the 4d elements (Zr = Hf, Nb = Ta) and Fe, Co, Ni have nearly equal radii; (b) is wrong because Nb and Ta have equal size, not Nb < Ta; (c) is

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Question ID VK-074810