Match the entries of column I with appropriate entries of column II and choose the correct option out of the four options given.
| Column I (Ion) | Column II (No. of unpaired electrons) |
| (A) Ti2+ | (p) 4 |
| (B) V2+ | (q) 5 |
| (C) Mn2+ | (r) 2 |
| (D) Fe2+ | (s) 3 |
Answer & explanation
Correct answer: option 4
(A) Ti2+: [Ar]3d2 ⇒ 2 unpaired electrons
(B) V2+ : [Ar]3d3 ⇒ 3 unpaired electrons
(C) Mn2+ : [Ar]3d5 ⇒ 5 unpaired electrons
(D) Fe2+ : [Ar]3d6 ⇒ 4 unpaired electrons