Why do transition elements show variable oxidation state?

Two compounds of iron are given below. FeSO_4 Fe_2(SO_4)_3 (The oxidation state of sulphate radical is -2): Why do transition elements show vari-able oxidation states?

(a) Define transition elements. (b) Give general electronic configuration of f-block elements.(c ) Most of transition elements are coloured, why? (d ) Transition elements show variable oxidation states, why?

Why do transition elements exhibit variable oxidation states ?

Why do transition elements exhibit variable oxidation states ?

Explain the following : (i) Most of the transition elements show variable oxidation states. (ii) Many transition elements and their compounds are paramagnetic .

Explain the following : (i) Most of the transition elements show variable oxidation states. (ii) Most of the compounds of transition elements are coloured. (iii) Many transition elements and their compounds are paramagnetic .

Write the reason for the statement given below: Transition elements shows variable oxidation state.