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The d- and f-Block Elements

1. Which one of the following first row transition elements is expected to have the
highest third ionization enthalpy ? (2024)
(A) Iron (Z = 26)
(B) Manganese (Z = 25)
(C) Chromium (Z = 24)
(D) Vanadium (Z = 23)
Ans. (B) Manganese (Z = 25)
2. two statements are given - one labelled as Assertion (A) and the other labelled
as Reason (R). Select the correct answer to these questions from the codes (A),
(B), (C) and (D) as given below. (2024)
(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.
Assertion (A) : Separation of Zr and Hf is difficult.
Reason (R) : Zr and Hf have similar radii due to lanthanoid contraction.
Ans. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the
correct explanation of the Assertion (A).

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