NEET Sample Paper NEET Sample Test Paper-14

  • question_answer Which one of the following is the correct increasing order of the magnitude of ionic radii of \[C{{e}^{3+}},L{{a}^{3+}},\]\[P{{m}^{3+}}\]and \[Y{{b}^{3+}}?\]

    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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