Question

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⁺

Answer 1

Correct option (d) Cr³⁺

Explanation :

+4 is the most stable oxidation state of vanadium and titanium. Mn³⁺ is not stable. Mn²⁺, rather than Mn³⁺ is much more stable in aqueous solution. For chromium, +3 oxidation state is most stable in aqueous solution.