Question
The E ^ value for the Mn ^ 3+ / Mn ^ 2+ couple is more positive than that of Cr ^ 3+ / Cr ^ 2+ or Fe ^ 3+ / Fe ^ 2+ due to change of
NEET
Chemistry
d and f Block Elements
2024
NEET 2024
NEET Chemistry Question (2024) — Solution
Options
- A. d ^5 to d ^2 configuration
- B. d ^4 to d ^5 configuration
- C. d^3 to d^5 configuration
- D. d^5 to d^4 configuration
Answer
B. d ^4 to d ^5 configuration
Step-by-step solution
E _ Mn ^ 3+ / Mn ^ 2+ ^ E _ Cr ^ 3+ / Cr ^ 2+ ^ or E _ Fe ^ 3+ / Fe ^ 2+ ^ Electronic configuration of Mn ^ 3+ =[ Ar ] 3 d^4 Electronic configuration of Mn ^ 2+ =[ Ar ] 3 d^5 Electronic configuration of Cr ^ 3+ =[ Ar ] 3 d^3 Electronic configuration of Cr ^ 2+ =[ Ar ] 3 d^4 As Mn ^ 3+ from d^4 configuration goes to more stable d^5 configuration (Half filled), due to more exchange energy in d^5 configuration.
Related: Chemistry — d and f Block Elements · All PYQ Banks