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Q.

Which of the following pairs of elements have almost similar atomic radii?

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a

Zr, Hf

b

Mo, W

c

Co, Ni 

d

Nb, Ta

answer is A, B, C, D.

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Detailed Solution

Which element in 3d, 4d, and 5d transition series has the

due to effect of lanthanide contraction the atomic sizes of 4d and 5 d series will be same,cobalt and nickel  have same size due to screening effect  

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