A) \[Mn\]and W
B) \[Mo\]and \[Tc\]
C) \[Fe\]and\[Re\]
D) \[Hf\]and\[Zr\]
E) \[Fe\]and \[Co\]
Correct Answer: D
Solution :
\[Zr\] and\[Hf\]possesses similar atomic size and hence are called twins of peridic table. It is due to lanthanide contraction.
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