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CUET · CHEMISTRY · PYQ PAPER 2025

Match the elements given in List-I with electronic configuration given in List-II
List - I (Element)List - II (Electronic configuration)
(A) Cerium(I) \([ Xe ] 4 f^{f 12} 6 s^2\)
(B) Erbium(II) \([ Rn ] 5 f^7 6 d^1 7 s^2\)
(C) Uranium(III) \([ Xe ] 4 f^1 5 d^1 6 s^2\)
(D) Curium(IV) \([ Rn ] 5 f^3 6 d^1 7 s^2\)

Choose the correct answer from the options given below:

  1. A (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
  2. B (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
  3. C (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
  4. D (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
Verified Solution

Answer & Solution

Correct Answer

(B) (A) - (III), (B) - (I), (C) - (IV), (D) - (II)

Step-by-step Solution

Detailed explanation

(A) Cerium (Z=58) \(\rightarrow\) (III) \([ Xe ] 4 f^1 5 d^1 6 s^2\) (B) Erbium (Z=68) \(\rightarrow\) (I) \([ Xe ] 4 f^{12} 6 s^2\) (C) Uranium (Z=92) \(\rightarrow\) (IV) \([ Rn ] 5 f^3 6 d^1 7 s^2\) (D) Curium (Z=96) \(\rightarrow\) (II) \([ Rn ] 5 f^7 6 d^1 7 s^2\)
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