`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.

Options

A. `Zn`
B. `Cr`
C. `H_(2)`
D. `Fe`

Answer

a

Explanation

`Zn` has highest tendency to get oxidized amongst `Cr, H_(2),` and `Fe`. So it is the strongest reducing agent. Since the standard reduction potential of `(E^(c-)._(Zn^(2+)|Zn))(-0.76V)` is lowest or standard oxidation of `E^(c-)._(Zn|Zn^(2+))(+0.76V)` is highest.