Question
Which of the following ions exhibit same value of spin only magnetic moment? (A). Ti ^ 3+ (B). Cr ^ 3+ (C). Mn ^ 2+ (D). Fe ^ 3+ (E). Sc ^ 3+ Choose the most appropriate answer from the options given below.
MHT CET
Chemistry
d and f Block Elements
2026
MHT CET 2026 (13 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. (B) and (D) only
- B. (A) and (E) only
- C. (C) and (D) only
- D. (A) and (D) only
Answer
C. (C) and (D) only
Step-by-step solution
Electronic configuration of the given ions and their number of unpaired electrons (n): Ti ^ 3+ : [ Ar ] 3d^1 n = 1 Cr ^ 3+ : [ Ar ] 3d^3 n = 3 Mn ^ 2+ : [ Ar ] 3d^5 n = 5 Fe ^ 3+ : [ Ar ] 3d^5 n = 5 Sc ^ 3+ : [ Ar ] 3d^0 n = 0 The spin-only magnetic moment is given by = n(n+2) BM. Since Mn ^ 2+ and Fe ^ 3+ have the same number of unpaired electrons (n = 5), they exhibit the same spin-only magnetic moment of 35 BM. Therefore, (C) and (D) only is the correct choice. Answer: (C) and (D) only
Related: Chemistry — d and f Block Elements · All PYQ Banks