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NEET Sample Paper NEET Sample Test Paper-1

  • question_answer
    \[C{{e}^{3+}},L{{a}^{3+}},P{{m}^{3+}}\] and \[Y{{b}^{3+}}\] have ionic radii in the increasing order as                  

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

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

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

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

    Correct Answer: B

    Solution :

    Ionic radii \[\propto \frac{1}{2}\] The values of Z for different elements are as \[Yb=70,\] \[Pm=61,\]\[Ce=58,\]\[La=57\]


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