JEE Main Chemistry question

Which of the following does not represent the correct order of the property indicated?

(A)Sc^{3+} > Cr^{3+} > Fe^{3+} > Mn^{3+} — ionic radiiCorrect
(B)Sc < Ti < Cr < Mn — density
(C)Mn^{2+} > Ni^{2+} > Co^{2+} < Fe^{2+} — ionic radii
(D)FeO < CaO < MnO < CuO — basic nature

Answer: (A)

Solution

Among the first-row transition metal ions, the ionic radius does not decrease in the simple atomic-number order Sc^{3+} > Cr^{3+} > Fe^{3+} > Mn^{3+} as stated in option (A); the actual order reflects the irregular stabilisation of specific d-electron configurations (such as the half-filled in

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Question ID VK-133313