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Redox reactions play a pivotal role in c...

Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential `(E^(@))` of two half-cell reactions decide which way the reaction is expected to proceed. A simple example is a Daniel cell in which zinc goes into solution and copper gets deposited.
`E^(@)(SRP)` of different half cells are given below:
`E_(Cu^(2+)|Cu)^(@)=0.34V, E_(Zn^(2+)|Zn)^(@)=-0.76V`
`E_(Ag^(+)|Ag=0.8V, E_(Mg^(2+)|Mg))=-2.37V` In which cell, `DeltaG^(@)` per "mole" of electron is most negative?

A

`Zn(s)|Zn^(2+)(1M)||Mg^(2+)(1M)|Mg(s)`

B

`Zn(s)|Zn^(2+)(1M)||Ag^(+)(1M)|Ag(s)`

C

`Cu(s)|Cu^(2+)(1M)||Ag^(+)(1M)|Ag(s)`

D

`Ag(s)|Ag^(+)(1M)||Mg^(2+)(1M)|Mg(s)`

Text Solution

Verified by Experts

The correct Answer is:
B
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Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential (E^(@)) of two half-cell reactions decide which way the reaction is expected to proceed. A simple example is a Daniel cell in which zinc goes into solution and copper gets deposited. For the cell: Pt |H_(2)(0.4"atm")H^(+)(pH=1)||H^(+)(pH=2)|H_(2)(0.1"atm")| Pt, the measured potential at 25^(@)C is: [Given: 2.303RT/F=0.06V, log 2=0.3]

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Redox reactions play a vital role in chemistry and biology. The values of standard redox potential (E^(@)) of two half-cells reactions decide which way the reaction is expected to proceed. A simple example is a Daniell cell in which zince goes into solution and copper gets deposited. Given below are set of half-cell reactions (acidic medium ) along with their E^(@) in V with respect to normal hydrogen electrode values. {:(l_(2)+2e^(-)rarr2l^(-),E^(@)=0.54),(Cl_(2)+2e^(-)rarr2Cl^(-)" ",E^(@)=1.36),(Mn^(3+)+e^(-)rarrMn^(2+),E^(2)=1.50),(Fe^(3+)+e^(-)rarrFe^(2+)" ",E^(@)=0.77),(O_(2)+4H^(+)+4e^(-)rarr2H_(2)O,E^(@)=1.23):} while Fe^(3+) is stable, Mn^(3+) is not stable in acid solution because :

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Given E_(Ag^(o+)|Ag)^(@) = + 0.80V , E_(Co^(2+)|Co)^(@) = -0.28 V, E_(Cu^(2+)|Cu)^(@) = + 0.34V, E_(Zn^(2+)|Zn)^@ = -0.76 V Which metal will corrode fastest?

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