JEE Main & Advanced Sample Paper JEE Main - Mock Test - 39

  • question_answer
    The lanthanoid contraction is responsible for the fact that (Atomic numbers: \[\operatorname{Zr}= 40, Y = 39\], \[\operatorname{Nb} = 41, Hf= 72,\,\,Zn= 30\])

    A) Zr and Y have about the same radius

    B) Zr and Nb have similar oxidation state

    C) Zr and Hf have about the same radius

    D) Zr and Zn have the same oxidation state

    Correct Answer: C

    Solution :

    A regular decrease in the size of the atoms and ions in lanthanoid series from \[{{\operatorname{La}}^{3+}}\,\,to\,\,L{{u}^{3+}}\] is called lanthanide contraction. The similarity in size of the atoms of Zr and Hf is due to the lanthanide contraction.

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