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Although Zr belongs to 4d and Hf belongs...

Although Zr belongs to 4d and Hf belongs to 5d transition series but it is quite difficult to separate them, Why?

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Separation of Zr and Hf are quite difficult because of lanthanoid contraction. Due to lanthanoid contration, they have almost same size (Zr = 160 pm and Hf = 159 pm) and thus, similar chemical properties. That's why it is very difficult to separate them by chemical methods.
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Knowledge Check

  • Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because

    A
    both belong to d-block.
    B
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    C
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  • Although zirconium belongs to 4d transition series and hafnium to 5d transition series even then they show similar physical and chemical properties because …….. .

    A
    both belong to d-block
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    C
    both have similar atomic radius
    D
    both belong to the same group of the periodic table.

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