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

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

A

generate heat

B

remove adsorbed oxygen from electrode surfaces

C

produce high purity water

D

create potential difference between the two electrodes

Text Solution

Verified by Experts

`2H_2+4OH^(-)(aq)to4 H_2O(1)+4e`
`underline(O_2(g)+2H_2O(I)+4e to4OH^(-)(aq))`
Fuell cell involves direct convrsion of chemical energy to electricity energy.
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Purpose of hydrogen -oxygen fuel cell is to

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 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

In carbon-hydrogen-oxygen compounds :

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 ? a. -1600 J K^(-1) b. -160 J K^(-1) c. 160 J K^(-1) d. 1600 J K^(-1)

How does hydrogen occur in nature?

The number of faradays required to produce one mole of water from hydrogen-oxygen fuel cell containing aqueous alkali as electrolyte is:

Discuss the working of hydrogen – oxygen fuel cell. What are the advantages of using this fuel cell?

VMC MODULES ENGLISH-ELECTROCHEMISTRY-JEE Main (Archive)
  1. In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to :

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  2. Consider the following E^(@) values E^(@) values E(Fe^(3+)//Fe^(2+))^...

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  3. The standard e.m.f of a cell, involving one electron change is found t...

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  4. The limiting molar conductivities overset(o)(wedge) for NaCl, KBr an...

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  5. In a cell that utilizes the reactions. Zn(s) + 2H^(+) (aq) rightarro...

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  6. The E(M^(3+)//M^(2+))^(@) values for Cr, Mn Fe and Co are -0.41, + 1.5...

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  7. For a spontaneous reaction, DeltaG, equilibrium constant K and E("cell...

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  8. Calculate, molar conductance of acetic acid using appropriate molar co...

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  9. The molar conductivities of wedge(NaOAc)^(@) and wedge(HCl)^(@) at in...

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  10. Given the data 25^(@) C, Ag+ I^(-) to AgI+e^(-) , E^(@) = 0.152V ...

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  11. Resistance of a conductivity cell filled with a solution of an electro...

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  12. The cell, Zn | Zn^(2+) (1M) || (1M) | Cu (E(cell)^(@) = 1.10V), was wa...

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  13. The equivalent conductances of two strong electrolytes at infinite dil...

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

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  15. In a fuel cell, methanol is used as fuel and oxygen gas is used as an ...

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  16. Given : E(Fe^(3+)//Fe)^(@) = -0.036V, E(FE^(2+)//Fe)^(@)= -0.439V. The...

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  17. The Gibbs energy for the decomposition of Al(2)O(3) at 500^(@)C is as ...

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

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  19. The standard reduction potentials for Zn^(2+)//Zn, Ni^(2+)//Ni, and Fe...

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  20. Use the data given in Q.8 and find out which of the following is the ...

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