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Solution


Q.

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of              [2021]
1 having similar chemical properties  
2 belonging to same group  
3 diagonal relationship  
4 lanthanoid contraction  

Ans.

(4)

The atomic and ionic radii of Zr and Hf are almost identical due to poor shielding effect of 4f-electrons, which lead to the lanthanoid contraction.