Question

Assertion (A): Separation of Zr and Hf is difficult.
Reason (R): Zr and Hf have similar radii due to lanthanoid contraction.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Lanthanoid contraction refers to the steady decrease in ionic radii of the lanthanoids, making elements like Zr and Hf chemically and physically similar.

Answer 1

The Correct Option is A

The close atomic radii of Zr and Hf, a consequence of lanthanoid contraction, impede their efficient separation by standard techniques.