A) \[Y{{b}^{3+}}<P{{m}^{3+}}<L{{a}^{3+}}<C{{e}^{3+}}\]
B) \[Y{{b}^{3+}}<P{{m}^{3+}}<C{{e}^{3+}}<L{{a}^{3+}}\]
C) \[P{{m}^{3+}}<L{{a}^{3+}}<C{{e}^{3+}}<Y{{b}^{3+}}\]
D) \[C{{e}^{3+}}<Y{{b}^{3+}}<P{{m}^{3+}}<L{{a}^{3+}}\]
Correct Answer: B
Solution :
\[\underset{\text{103}\,\text{pm}}{\mathop{\text{L}{{\text{a}}^{\text{3+}}}}}\,\,\,\text{}\,\,\underset{\text{102}\,\text{pm}}{\mathop{\text{C}{{\text{e}}^{\text{3+}}}}}\,\,\,\text{}\,\,\underset{\text{97}\,\text{pm}}{\mathop{\text{P}{{\text{m}}^{\text{3+}}}}}\,\,\,\text{}\,\,\underset{\text{86}\text{.8}\,\text{pm}}{\mathop{\text{Y}{{\text{b}}^{\text{3+}}}}}\,\] Hence, the correct option is [b].
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