D-And F-Block Elements Ques 244

Question: Arrange $ C{{e}^{+3}},L{{a}^{+3}},P{{m}^{+3}} $ and $ Y{{b}^{+3}} $ in increasing order of their ionic radii

[AIEEE 2002]

Options:

A) $ Y{{b}^{+3}}<P{{m}^{+3}}<C{{e}^{+3}}<L{{a}^{+3}} $

B) $ C{{e}^{+3}}<Y{{b}^{+3}}<P{{m}^{+3}}<L{{a}^{+3}} $

C) $ Y{{b}^{+3}}<P{{m}^{+3}}<L{{a}^{+3}}<C{{e}^{+3}} $

D) $ P{{m}^{+3}}<L{{a}^{+3}}<C{{e}^{+3}}<Y{{b}^{+3}} $

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Answer:

Correct Answer: A

Solution:

Due to Lanthanoid contraction order will be $ Y{{b}^{+3}}<P{{m}^{3+}}<C{{e}^{+3}}<L{{a}^{3+}} $



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