1.

Which among the following pairs of elements is 'not' an example of chemical twins ?

Answer»

Zr and Hf
Nb and Ta
Mo and W
Ta and Re

Solution :a PAIR of elements having similar properties due to similar atomic radii are called chemical twins and they are elements of 4d and 5d - series because they have large DIFFERENCE in their atomic radii while all other elements have almost similar atomic radii.
Zr (145 Pm) and Hf (144Pm)
Nb (134 Pm) and Ta(134 Pm)
Mo (129 Pm) and W (130 Pm)
Ta (134 Pm) ad Re (114 Pm).


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