Among the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other,in:

In which of the following pairs of ions, the higher oxidation state in aqueous solution is more stable than the other? I. TI^(+), TI^(3+) II. Cu^(+),Cu^(2+) III. Cr^(2+),Cr^(3+) IV. V^(2+),V^4+

+2 oxidation state of lead is more stable than +4 , because of

Which one of the following ions is the most stable in aqueous solutions ?

Which of the following ions is most stable in aqueous solution ?