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JEE Main & Advanced Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Critical Thinking

  • question_answer
    Arrange \[C{{e}^{+3}},L{{a}^{+3}},P{{m}^{+3}}\] and \[Y{{b}^{+3}}\] in increasing order of their ionic radii [AIEEE 2002]

    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) \[P{{m}^{+3}}<L{{a}^{+3}}<C{{e}^{+3}}<Y{{b}^{+3}}\]

    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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