CUET · CHEMISTRY · PYQ PAPER 2025
Arrange the following transition metal ions in the increasing order of unpaired electrons.
(A) \(Cu ^{2+}\)
(B) \(Cr ^{2+}\)
(C) \(Ni ^{2+}\)
(D) \(Sc ^{3+}\)
Choose the correct answer from the options given below:
- A (A), (D), (C), (B)
- B (D), (B), (A), (C)
- C (B), (A), (D), (C)
- D (D), (A), (C), (B)
Answer & Solution
Correct Answer
(D) (D), (A), (C), (B)
Step-by-step Solution
Detailed explanation
(A) \(Cu ^{2+}\): \([Ar] 3d^9\), Unpaired electrons = 1 (B) \(Cr ^{2+}\): \([Ar] 3d^4\), Unpaired electrons = 4 (C) \(Ni ^{2+}\): \([Ar] 3d^8\), Unpaired electrons = 2 (D) \(Sc ^{3+}\): \([Ar] 3d^0\), Unpaired electrons = 0 Increasing order: (D) < (A) < (C) < (B)
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