The lanthanide contraction is responsible for the fact that

  • Option 1)

     Zr  and Y have about the same radius

  • Option 2)

     Zr and Nb have similar oxidation state

  • Option 3)

     Zr  and Hf have about the same radius

  • Option 4)

    Zr and Zn have the same oxidation state

 

Answers (1)

As we learnt in

Lanthanoid contraction -

The filling of if orbits before 5d orbits result regular decrease in atomic radii called Lanthanoid contraction or can say the size of radii not much increase.

- wherein

e.g.\:\:\:\:3d\rightarrow 4d\rightarrow 5d

 

 

 Due to Lanthanoid contraction size of 5d-series elements is smaller than 4d-series element, that's why Zr and Hf have almost same atomic radii.


Option 1)

 Zr  and Y have about the same radius

This option is incorrect

Option 2)

 Zr and Nb have similar oxidation state

This option is incorrect

Option 3)

 Zr  and Hf have about the same radius

This option is correct

Option 4)

Zr and Zn have the same oxidation state

This option is incorrect

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