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Aerial oxidation gradually changes Fe^(2...

Aerial oxidation gradually changes `Fe^(2+)` ions to `Fe^(3+)` ions. Which of the following should be added to `Fe^(2+)` ions to prevent this from happening?
Use `E_(Fe^(3+)//Fe^(2-))^(@) = +0.771 V, E_(Cu^(2+)//Cu)^(@) = +0.34 V.`
`E_(Mg^(2+)//Mg = -2.37 V`

A

`Cu`

B

`Mg^(2+)` ions

C

`Mg`

D

`Cu^(2+)` ions

Text Solution

Verified by Experts

The correct Answer is:
C
This is possible provided the species added has a greater tendency *then `Fe^(2+)` ions) to get oxidizied. This implies that the selcteed redox couple shoulh have lower reduction potential. Than `E_(Fe^(3+)//Fe^(2+))^(@)`.
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