Q. Which one of the following ions is the most stable in aqueous solution? (At. No. Ti = 22, V = 23, Cr = 24, Mn = 25)
A) V³⁺
B) Ti³⁺
C) Mn³⁺
D) Cr³⁺
Explanation
[Solution from source] Cr³⁺ (3d³) has a half-filled t₂g set and a very high hydration energy, making it the most stable in water. Ti³⁺ and V³⁺ are oxidised easily, and Mn³⁺ (d⁴) disproportionates. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.