The correct order of ionic radii of Y^ 3+ , La^ 3+ , Eu^ 3+ and Lu^ 3+ is

MHT CET Chemistry question

The correct order of ionic radii of Y, La, Eu and Lu is

(A)
(B)
(C)Correct
(D)

Answer: (C)

Solution

By lanthanoid contraction the radius falls from La3+ (largest) through Eu3+ to Lu3+ (smallest lanthanoid ion), while Y3+ is about as small as the heavy lanthanoid ions; options

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Question ID VK-074316