InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
The `E^(@)` values in respect of the electrodes of chromium `(Z= =24),`manganese `( Z = 25)` and iron `( Z= 26 ) `are `: Cr^(3+) // Cr^(2+) = - 0.4 V, Mn^(3+)//Mn^(2+) = + 1.5 V, Fe^(3+) //Fe^(2+) = + 0.8 V`. On the basis of the above information compare the feasiblities of further oxidation of their `+2` oxidation states. |
| Answer» `-ve` value of `E^(@)` for `Cr^(3+) //Cr^(2+)` shows that `Cr^(2+)` is least stable. Greater `+ve` value for `Mn^(3+)// Mn^(2+)` than that for `Fe^(3+) //Fe^(2+)` shows that `Mn^(2+)` is more stable than `Fe^(2+)` . Hence, stability of `+2` oxidation state is in the order `: Cr^(2+) lt Fe^(2+) lt Mn^(2+)` or the oxidation of their `+2` state to `+3` state is in the order `: Cr^(2+) gt Fe^(2+) gt Mn^(2+)` | |