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In a hydrogen-oxygen fuel cell, combusti...

In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

A

produce high purity water

B

create potential difference between two electrodes

C

generte heat

D

remove adsorbed oxygen from electron surfaces

Text Solution

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The correct Answer is:
B
In `H_(2)-O_(2)` fiel cell, the combusition of `H_(2)` occurs to create potential diff erence between the two electrodes.
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Fuel cells : Fuel cells are galvanic cells in which the chemical energy of fuel cell is directly converted into electrical energy. A type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst ( platinum, silver, or metal oxide ). The electrodes are placed in aqueous solution of NaOH . Oxygen and hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(o+) which is neutralized by overset(c-)(O)H, i.e., anodic reaction. At cathode, O_(2) gets reduced to overset(c-)(O)H Hence, the net reaction is The overall reaction has DeltaH=-285.6 kJ mol^(-1) and DeltaG=-237.4 kJ mol^(-1) at 25^(@)C If the cell voltage is 1.23V for the H_(2)-O_(2) fuel cell and for the half cell :

Fuel cells : Fuel cells are galvanic cells in which the chemical energy of fuel cell is directly converted into electrical energy. A type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst ( platinum, silver, or metal oxide ). The electrodes are placed in aqueous solution of NaOH . Oxygen and hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(o+) which is neutralized by overset(c-)(O)H, i.e., anodic reaction. At cathode, O_(2) gets reduced to overset(c-)(O)H Hence, the net reaction is The overall reaction has DeltaH=-285.6 kJ mol^(-1) and DeltaG=-237.4 kJ mol^(-1) at 25^(@)C What is the value of DeltaS^(c-) for the fuel cell at 25^(@)C ?

Fuel cells : Fuel cells are galvanic cells in which the chemical energy of fuel cell is directly converted into electrical energy. A type of fuel cell is a hydrogen - oxygen fuel cell. It consists of two electrodes made up of two porous graphite impregnated with a catalyst ( platinum, silver, or metal oxide ). The electrodes are placed in aqueous solution of NaOH . Oxygen and hydrogen are continuously fed into the cell. Hydrogen gets oxidized to H^(o+) which is neutralized by overset(c-)(O)H, i.e., anodic reaction. At cathode, O_(2) gets reduced to overset(c-)(O)H Hence, the net reaction is The overall reaction has DeltaH=-285.6 kJ mol^(-1) and DeltaG=-237.4 kJ mol^(-1) at 25^(@)C Suppose the concentration of hydroxide ioin in the cell is doubled, then the cell voltage will be

A hydrogen fuel cell uses hydrogen and

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  2. Which of the fo llowing reaction is possible at anode?

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  3. In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to

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  6. For a spontaneous reaction theDeltaG) equilibrium constnat (K)and E("C...

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  7. If the E("cell")^(@) for a given reaction has a negative value, then w...

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  8. Wltich or the roilowing expressions correctlY represents the equivalen...

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  9. Given: E(Cr^(3+)//Cr)^(@)=1.33 V, E(Cl//Cl^(-))^(@) =1.36V CIBased o...

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  10. The standard electrode potentials (E(M^(+)//M)^(@)) of four metals A,...

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  11. Which of the fo llowing statements is correct?

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  12. Molar ionic conductivities of a two-bivalent electrolytes x ^(2+) and ...

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  13. Thecell, Zn|Zn^(2+)(1M)||Cu^(2+)(1M) |Cu (E("cell")^(@)=1.10V) was all...

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

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  15. Given Fe^(3+)(aq)+e ^(-)toFe ^(2+)(aq), E ^(@) =+0.77V Al ^(3+) (a...

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  16. Standard free energies of formation (in kJ/mol) at 298 K are -237.2, -...

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  17. Given E(Cr^(3+)//Cr)^(@)=-0.72 V, E(Fe ^(2+)//Fe)^(@)=-0.42V. The pot...

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