JEE Advanced Chemistry question

Which of the following statements concerning lanthanide elements is false?

(A)Lanthanides are separated from one another by ion-exchange method
(B)Ionic radii of trivalent lanthanides steadily increase with increase in the atomic numberCorrect
(C)All lanthanides are highly dense metals
(D)More characteristic oxidation state of lanthanides elements is +3

Answer: (B)

Solution

Owing to the lanthanide contraction, the ionic radii of ions steadily *decrease* — not increase — across the series as atomic number rises, because the poorly-shielding electrons allow

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Question ID VK-159827