In which pair, second ion is more stable than first?

In which pair second ions is more stable than first ?

Some pairs of ions are given below. In which pair, first ion is more stable than second?

Some pairs of ions are given below. In which pair, first ion is more stable than second ?

Some pairs of ions are given below. In which pair, first ion is more stable than second ?

Which of the following is second ion is more stable than the first

Among the following pair of reactions in which pair second reaction is more reactive than first for S_(N^(1)) reaction?

Among the given pairs, in which pair second compound is more acidic than first ?