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The formal potential of Fe^(3+)|Fe^(2+) ...

The formal potential of `Fe^(3+)|Fe^(2+)` in a sulphuric acid and phosphoric and mixture `(E^(@)=+0.61V)` is much lower than the standard potential `(E^(@)=+0.77V)`. The is due to -

A

formation of the species `[FeHPO_(4)]^(+)`

B

lowering of potential upon complexation

C

formation of the species `[FeSO_(4)]^(+)`

D

high acidity of the medium

Text Solution

Verified by Experts

The correct Answer is:
A, B, D
Due to the formation of different complexes, concentration of `Fe^(3+)` decreases. Thus the formal potential of `Fe^(3+)|Fe^(2+)` is lower than its standard potential.
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