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DeltaG = DeltaH-TdeltaS and DeltaG = Del...

`DeltaG = DeltaH-TdeltaS and DeltaG = DeltaH + T[(d(DeltaG))/(dT)] " then " ((dE_("cell"))/(dT))` is

A

`(DeltaS)/(nF)`

B

`(nE)/(DeltaS)`

C

`-nFE_("cell")`

D

`+nFE_("cell")`

Text Solution

Verified by Experts

The correct Answer is:
A
`(d(DeltaG))/(dT) = -DeltaS , DeltaS = nFE_("cell") [ (d(DeltaG))/(dT)]_(p) = -nF (dE_("cell"))/(dT), -nF (dE_("cell"))/(dT)=DeltaS , ((dE_("cell"))/(dT)) = (DeltaS)/(nF)`
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If Delta G = Delta H - T Delta S and Delta G = Delta H + T [(d(Delta G))/(dT)]_(P) then variation of emf of a cell E, with temperature T is given by:

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The driving force DeltaG diminishes to zero on the way to equilibrium, just as in any other spontaneous process. Both DeltaG and the corresponding cell potential (E = (DeltaG)/(nF)) zero when the redox reaction comes to equilibrium. The Nernst equation for the redox process of the cell may be given as : E= E^(@) -(0.059)/( n) log Q The key to the relationship is the standard cell potential E^(@) , derived from the standard free energy change as : E^(@)=-(DeltaG^(@))/(nF) . At equilibrium, the Nernst equation is given as : E^(@) = -(0.059)/(n) log K At equilibrium , when K = 1 the correct relation is

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AAKASH SERIES-ELECTROCHEMISTRY -LEVEL-II (LECTURE SHEET ( EXERCISE -I ( SINGLE & ONE OR MORE THAN ONE CORRECT ANSWER )))
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  2. In a lead storage battery

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  3. Which one is correct among the following give, the half cell emf's E^...

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  4. For the cell (at 298 K ) Ag((g)) // AgCl((s)) // Cl((aq))^(-) ||AgNO(3...

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  5. The value of the reaction quotient ,Q for the cell Zn(s) |Zn^(2+) (0.0...

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  6. DeltaG = DeltaH-TdeltaS and DeltaG = DeltaH + T[(d(DeltaG))/(dT)] " ...

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  7. For the cell Zn|Zn^(2+) (C1)||Zn^(2+) (C2)|Zn. DeltaG is negative if :

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  8. The Nernst equation , E = E^(0) -(RT)/(nF) . In Q indicates that the ...

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  9. The half cell reaction for the corrosion are , 2H^(+) + (1)/(2) O2 + ...

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  10. The E^(@) at 25^(@)C for the following reaction at the indicated conc...

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  11. A fuel cell develops an electrical potential from the combustion of b...

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  12. For a cell reaction 2H(2(g)) + O(2(g)) to 2H2O((l)) DeltaS(298)^(@) ...

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  13. Copper reduces NO3^(-) into NO and NO2 depending upon concentration of...

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  14. Consider the following standard reduction potentials Fe^(3+)(aq) + e...

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  15. Which of the following statements is / are correct ?

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  16. Which of the following facts regarding the movement of anions in the s...

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  17. Which of the following statements is correct ? If E(Cu^(2+)|Cu)^(@)...

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  18. The oxidation potential of hydrogen half-cell will be negative if :

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  19. Coulomb is the quantity of charge defined as :

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  20. E^(@) for two reactions are given below : Cr^(+3) + 3e^(-) to Cr , E^(...

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