`E^(c-)` of some elements are given as `:`
`{:(I_(2)+2e^(-)rarr 2I^(c-),,,,E^(c-)=0.54V),(MnO_(4)^(c-)+8H^(o+)+5e^(-)rarr Mn^(2+)+4H_(2)O,,,,E^(c-)=1.52V),(Fe^(3+)+e^(-)rarr Fe^(2+),,,,E^(c-)=0.77V),(Sn^(4+)+2e^(-)rarr Sn^(2+),,,,E^(c-)=0.1V):}`
`a.` Select the stronges reductant and weakes oxidant among these elements.
`b.` Select the weakest reductant and strongest oxidant among these elements.

Explanation

`a.` Higher the positive value for oxidant potential, more is the tendency for oxidation and the element will act as a stronger reductant.
or
Lower the value for potential, more is the tendency for oxidation and the element will act as a stronger reductant.
Maximum `E^(c-)._(o x i d)(-0.1 V)` or minimum `E^(c-)._(red) (0.1V)` for `Sn^(2+)` to `Sn^(4+)`.
Strongest reductant `: Sn^(2+)`
Weakest oxidant `: Sn^(4+)`
`b. E^(c-)._(red)` value `(1.52V)` is highest for `MnO_(4)^(c-)` to `Mn^(2+)`. More the tendency to undergo reduction and more the element will act as a stronger oxidant.
`:. `Strongest oxidant `: MnO_(4)^(c-)`
Weakest reductant`: Mn^(2+)`