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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 acid mixture `(E^@ = +0.61 V)` is much lower than the standard potential `(E^@ = +0.77 V)`. This 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
In the aqueous solution if `H_2 SO_4` is present then iron wil form hydrated iron sulphate rather than formaing `[FeSO_(4) ]^(+)` solution Moreover . Tendency of formation of ` [FeSO_4]^(+)`
is decreases and accordinglty potential decrease =s.
`E=E^@ - ( 0.0591 )/( n ) log_(10) ([Fe^(2+)])/([Fe^(3+)])`
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