Question

On the basis of the following `E^(@)` values, the stongest oxidizing agent is `[Fe(CN)_(6)]^(4-) rarr [Fe(CN)_(6)]^(3-)+e^(-), E^(@) = -0.35 V`
`Fe^(2+) rarr Fe^(3+)+e^(-), E^(@) = -0.77 V`
A. `[Fe(CN)_(6)]^(4-)`
B. `Fe^(2+)`
C. `Fe^(3+)`
D. `[Fe(CN)_(6)]^(3-)`

Answer 1

Correct Answer - C
( c) Substance which have higher reduction potential are stronger oxidising agent .
`[Fe(CN)_(6)]^(4-) to [Fe(CN)_(6)]^(3-)+e^(-),E^(@)=-0.35 V`
`Fe^(2+) to Fe^(3+)+e^(-), E^(@)=-0.77 V` ltbr ` because E_(oxi)^(@)=-E_(red)^(@)`
`:. [Fe(CN)_(6)]^(3-)+e^(-) to [Fe(CN)_(6)]^(4-),E^(@)=-0.35 V`
`Fe^(3+)+e^(-) to Fe^(2+), E^(@)=-0.77 V`
Hence , `Fe^(3+)` has maximum tendency to reduced, so it is the strongest oxidising agent.