Out of `Fe^(2+)` and `Fe^(3+)` ions, which is more stable ?

Among Fe^(2+) and Fe^(3+) , which is more stable ? Why ?

Between Fe^(2+) ion and Fe^(3+) ion which is more stable ?

(i) State Hund's rule. (ii) Between two ions Fe^(2+) and Fe^(3+) , which one is more stable and why?

Out of Fe^(2+) and Fe^(3+) which is more paramagnetic and why?

Out of Fe^(2+) and Fe^(3+) which is more paramagnetic and why ?

Among Fe^(2+) and Fe^(3+) which is more stable? Give reason.

(i)Which one out of Fe^(2+) and Fe^(3+) ions is more paramagnetic and why (ii)Which of the following ions are expected to becoloured and why Fe^(2+), Mn^(2+), Cr^(3+), Cu^(+) Sc^(3+), Ti^(4+)