A) IV<III<I<II
B) I<IV<III<II
C) IV<III<II<I
D) III<II<I<IV
Correct Answer: A
Solution :
[a] Ionic radii decrease across lanthanide series due to lanthanide contraction. As all ions are in +3 O.S., ionic radii will follow the trend of atomic radii. \[\therefore \underset{\left( Z=57 \right)}{\mathop{L{{a}^{3+}}}}\,>\underset{(Z=58)}{\mathop{C{{e}^{3+}}}}\,>\underset{(Z=61)}{\mathop{P{{m}^{3+}}}}\,>\underset{(Z=70)}{\mathop{Y{{b}^{3+}}}}\,\]You need to login to perform this action.
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