STANDARDChemistry-Periodic Table

STANDARD Chemistry Lanthanoids MCQ Question

Type: MCQ-conceptual-Medium

The correct order of ionic radii of Ce, La, Pm and Yb in +3 oxidation state is

A

La³⁺ < Pm³⁺ < Ce³⁺ < Yb³⁺

B

Yb³⁺ < Pm³⁺ < Ce³⁺ < La³⁺

C

La³⁺ < Ce³⁺ < Pm³⁺ < Yb³⁺

D

Yb³⁺ < Ce³⁺ < Pm³⁺ < La³⁺

Correct Answer

Option B

Detailed Explanation

The overall decrease in atomic and ionic radii from La³⁺ to Lu³⁺ is called lanthanoid contraction. Hence, the correct order is Yb³⁺ < Pm³⁺ < Ce³⁺ < La³⁺.

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