Question

Assertion (A): \[\ce{Zr}\] and \[\ce{Hf}\] are of almost similar atomic radii.

Reason (R): This is due to Lanthanoid contraction.

Options

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

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

• Assertion (A) is true, but Reason (R) is false.

• Assertion (A) is false, but Reason (R) is true.

Answer 1

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Explanation:

Both \[\ce{Zr}\] and \[\ce{Hf}\] have the same atomic radii, and this is due to the lanthanoid contraction.