CUET · CHEMISTRY · PYQ PAPER 2025
Match the ions given in List - I with number of unpaired electrons given in List - II
| List - I (Ion) | List-II (Number of unpaired electrons) |
| (A) \(V ^{ 2 + }\) | (I) 1 |
| (B) \(Cr ^{2+}\) | (II) 4 |
| (C) \(Ti ^{2+}\) | (III) 3 |
| (D) \(Cu ^{2+}\) | (IV) 2 |
Choose the correct answer from the options given below:
- A (A) - (I), (B) - (II), (C) - (IV), (D) - (III)
- B (A) - (III), (B) - (II), (C) - (I), (D) - (IV)
- C (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
- D (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
Answer & Solution
Correct Answer
(D) (A) - (III), (B) - (II), (C) - (IV), (D) - (I)
Step-by-step Solution
Detailed explanation
(A) \(V\) (\(Z=23\)): \([Ar]3d^3 4s^2 \Rightarrow V^{2+}\): \([Ar]3d^3\). Unpaired electrons = 3. (B) \(Cr\) (\(Z=24\)): \([Ar]3d^5 4s^1 \Rightarrow Cr^{2+}\): \([Ar]3d^4\). Unpaired electrons = 4. (C) \(Ti\) (\(Z=22\)): \([Ar]3d^2 4s^2 \Rightarrow Ti^{2+}\): \([Ar]3d^2\).…
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