Hf and Zr occur together in nature and their separation is difficult because
Small size of both the metals.
Similar reactivity of the metals.
Similar size of both the metals.
All of the above.
The almost identical radii of Zr (160 pm) and Hf (159 pm), a consequence of the lanthanoid contraction, account for their occurrence together in nature and for the difficulty faced in their separation.
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