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

Options

A. `Tl^(+),Tl^(3+)`
B. `Cu^(+),Cu^(2+)`
C. `Cr^(2+),Cr^(3+)`
D. `V^(2+), VO^(2+)`

Explanation

`Tl^(+)`is more stable than `Tl^(3+)`due to invert pair effect ( Tl belongs to Group 13 and is the last element of the Group ).