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NEET Chemistry The d-and f-Block Elements / d तथा f ब्लॉक के तत्व Question Bank Self Evaluation Test - The d-and f-Block Elements

  • question_answer
    Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers).

    A) \[Zr\left( 40 \right)\] and \[Nb\left( 41 \right)\]

    B) \[Zr\left( 40 \right)\] and\[Hf\left( 72 \right)\]

    C) \[Zr\left( 40 \right)\] and \[Ta\left( 73 \right)\]          

    D) \[Ti\left( 22 \right)\] and \[Zr\left( 40 \right)\]

    Correct Answer: B

    Solution :

    [b] Due to lanthanoid contraction atomic radii of Zr and Hf is almost similar.


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