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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    The correct order of ionic radii of \[{{Y}^{3+}},\]\[L{{a}^{3+}},\]\[E{{u}^{3+}}\] and \[L{{u}^{3+}}\] is

    A) \[{{Y}^{3+}}<L{{a}^{3+}}<E{{u}^{3+}}<L{{u}^{3+}}\]

    B) \[L{{u}^{3+}}<E{{u}^{3+}}<L{{a}^{3+}}<{{Y}^{3+}}\]

    C) \[L{{a}^{3+}}<E{{u}^{3+}}<L{{u}^{3+}}<{{Y}^{3+}}\]

    D) \[{{Y}^{3+}}<L{{u}^{3+}}<E{{u}^{3+}}<L{{a}^{3+}}\]

    Correct Answer: B

    Solution :

    [b] The correct order of ionic radii is At. No. \[Lu_{71}^{3+}<Eu_{63}^{3+}<La_{57}^{3+}<Y_{39}^{3+}\] [In lanthanides ionic radii \[({{M}^{3+}})\] decreases with increase in atomic number. \[{{Y}^{3+}}\] belongs d-block].


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