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Solution


Q.

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii (Numbers in the parenthesis are atomic numbers)          [2015]
1 Zr (40) and Hf (72)  
2 Zr (40) and Ta (73)  
3 Ti (22) and Zr (40)  
4 Zr (40) and Nb (41)  

Ans.

(1)

Zr and Hf have nearly same radii due to lanthanoid contraction.