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The efficiency of a fuel cell is given b...

The efficiency of a fuel cell is given by:

A

`(DeltaH)/(DeltaG)`

B

`(DeltaG)/(DeltaS)`

C

`(DeltaG)/(DeltaH)`

D

`(DeltaS)/(DeltaG)`

Text Solution

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The correct Answer is:
C
By formula
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A fuel cell is a cell that is continously supplied with an oxidant and a reductant so that if can deliver a current indefinitely. Fuel cells offer the possibility of achieving high thermodynamic efficiency in the conversion of Gibbs energy into mechanical work.Internal combustion engines at best convert only the fraction (T_2-T_1)//T_2 of the heat of combustion into mechanical work. While the thermodynamic efficiency of the fuel cell is given by, eta=(DeltaG)/(DeltaH) , where DeltaG is the Gibbs energy change for the cell reaction and DeltaH is the enthalpy change of the cell reaction.A hydrogen-oxygen fuel cell may have an acidic or alkaline electrolyte. Pt|H_2(g)|H^(+)(aq.)||H_2O(l)|O_(2)(g)|Pt , (2.303 RT)/F=0.06 The above fuel cell is used to produce constant current supply under constant temperature & 30 atm constant total pressure conditions in a cylinder.If 10 moles H_2 and 5 moles of O_2 were taken initially. Rate of consumption of O_2 is 10 milli moles per minute. The half-cell reactions are 1/2O_2(g)+2H^+(aq)+2e^(-)toH_2O(l) E^(@)=1.246 V 2H^+(aq)+2e^(-) to H_2(g) E^(@)=0 To maximize the power per unit mass of an electrochemical cell, the electronic and electrolytic resistances of the cell must be minimized.Since fused salts have lower electolytic resistances than aqueous solutions, high-temperature electrochemical cells are of special interest for practical applications. Calculate e.m.f of the given cell at t=0.(log 2=0.3)

Thermodynamic efficiency of a cell is given by:

The thermodynamic efficiency of cell is given by

The thermodynamic efficiency of cell is given by

The efficiency of a fuel cell si 80% and the standard heat of reaction is -300kJ . The reaction involves two electrons in redox change. E^(c-) for the cell is

ERRORLESS-ELECTROCHEMISTRY-NCERT BASED QUESTIONS (CELL CONSTANT AND ELECTROCHEMICAL CELLS)
  1. Which of the following statements is true for fuel cells ?

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  2. The reaction, (1)/(2)H(2)(g) + AgCl(s) H^(+)(aq)+Cl^(-) (aq)+Ag(s). Oc...

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  3. Which of the following statement is not correct about an inert electro...

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  4. An electrochemical cell an behave like an electrolytic cell when

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  5. Which of the following reactions canot be a base for electrochemical c...

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  6. The electrolyte used in Leclanche cell is-

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  7. In a galvanic cell, the electrons flow from :

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  8. If the half-cell reaction A+e^(-)toA^(-) has a large negative reductio...

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  9. Which of the following statements is true for an electrochemical cell ...

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  10. A depolarizer used in dry cell is :

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  11. Which of the following is not a function of salt bridge ?

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  12. The efficiency of a fuel cell is given by:

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  13. The electrode reactions that takes place at the anode of CH(4)-O(2) fu...

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  14. In which cell the free energy of a chemical reaction is directly conve...

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  15. While charging the lead storage battery:

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  16. When a lead storage battery is charged:

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  17. Which coloruless gas evolves when NH(4)CI reacts with zinc in a dr...

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  18. When a lead storage battery is discharged

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  19. Which of the following is used widely in the manufacture of lead stora...

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  20. If the molar conductivities ("in" S cm^(2) "mol"^(-1)) of NaCl,KCl and...

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