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Chemistry
Which one of the following pairs of elements is called chemical twins because of their very similar chemical properties?
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Q. Which one of the following pairs of elements is called chemical twins because of their very similar chemical properties?
KEAM
KEAM 2004
A
$ Mn $ and W
B
$ Mo $ and $ Tc $
C
$ Fe $ and $ Re $
D
$ Hf $ and $ Zr $
E
$ Fe $ and $ Co $
Solution:
$ Zr $ and $ Hf $ possesses similar atomic size and hence are called twins of peridic table. It is due to lanthanide contraction.