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Standard electrode potential of two half...

Standard electrode potential of two half-reactions are given below:
`Fe^(2+)iffFe , E^(@)=-0.44V`
`Fe^(3+)iffFe^(2+) , E^(@)=+0.77V`
If `Fe^(2+) , Fe^(3+)` and fe are kept together:

A

`Fe^(3+)` Increase

B

`Fe^(3+)` decrease

C

`Fe^(2+)//Fe^(3+)` remains unchanged

D

`Fe^(2+)` decreases

Text Solution

Verified by Experts

The correct Answer is:
B
`{:("Anode",,Ferarr Fe^(@+)+2e^(-),,),("Cathode",,[Fe^(3+)+e^(-)rarrFe^(2+)]xx2,,),("Cell",,Fe+2Fe^(3+)rarr3Fe^(2+),,),(E^(2)=0.77-(-0.44)=1.21V,,,,):}`
`DeltaG^(@)=( - )ve" "` Reaction is spontaneous.
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