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Which of the following statements is/are incorrect? (A) Zr (Z = 40) belongs to the f-block elements (B) IE(Be) > IE(B) (C) Zn is a transition element (D) Gd (Z = 64) is an inner-transition element

1. (A) Zr (Z = 40) belongs to the f-block elements
2. (B) IE(Be) > IE(B)
3. (C) Zn is a transition element
4. (D) Gd (Z = 64) is an inner-transition element

Correct answer: (A) Zr (Z = 40) belongs to the f-block elements

Solution

Zr (Z=40) is a d-block element (group 4), not an f-block element (statement A is incorrect). Zn (Z=30) has fully filled d-orbitals in all oxidation states and is not a transition element by strict definition (statement C is also incorrect). Statements B and D are correct.

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