Which is a stronger reducing agent `Cr^(2+)` or `Fe^(2+)` and why ?

{:(E_(M^(2+)//M)^(@),Cr,Mn, Fe, Co, Ni, Cu),(,-0.91,-1.18,-0.44,-0.28,-0.25,+0.34):} From the given data of E^(@) values, answer the following questions : (i) Why is E_((Cu^(2+)//Cu))^(@) value exceptionally positive ? (ii) Why is E_((M^(2+)//M))^(@) vlue highly negative as compared to other elements ? (iii) Which is a stronger reducing agent , Cr^(2+) or Fe^(2+) ? Give reason.

Which is a stronger reducing agent , SbH_(3) of BiH_(3) , and why ?

Which is a stronger reducing agent, SbH_(3) " or " BiH_(3) and why ?

Which is a stronger reducing agent , SbH_(3) " or " BiH_(3) and why ?

Use the data to answer the following and also justify giving rason: {:(," "Cr," "Mn," "Fe," "Co),(E_(M^(2+)//M)^0,-0.91,-1.18,-0.44,-0.28),(E_(M^(2+)//M^(2+))^0,-0.41,+1.57,+0.77,+1.97):} ( a) Which is a stronger redusing agent in aqueous medium Cr^(2) or Fe^(2+) and why ? ( b) Which is the most stable ion in +2 oxidartion and why ?