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How does H(2)-O(2) fuel cell operate?...

How does `H_(2)-O_(2)` fuel cell operate?

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At anode: `2H_(2)(g)+4OH^(-)(aq)to4H_(2)O+4e^(-)`
At cathode: `underline(O_(2)(g)+2H_(2)O(e)+4e^(-)to4OH^(-)(aq))`
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EMF of an H_(2)-O_(2) fuel 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 :

How does fuel cell operate

Draw a neat and labelled diagram for H_(2)-O_(2) fuel cell. Write the reaction which occurs at cathode of the cell.

W.r.t. H_(2)-O_(2) fuel cell the correct statement is

For a H_(2) - O_(2) fuel cell , the theoretical voltage has been found to be 1.23 V and Delta H to be -285 kJ mol^(-1) . The efficiency of the fuel cell is

(a) What are fuel cells ? Explain the electrode reactions involved in the working of H_(2)-O_(2) fuel cell. (b) Represent the galvanic cell in which the reaction Zn(s) + Cu^(2)(aq) to Zn^(2+) (aq) + Cu(s) takes place.

What are fuel cells ? Explain the electrode reactions involved in the working of H_(2) - O_(2) fuel cell.

PRADEEP-ELECTROCHEMISTRY-ADDITIONAL QUESTIONS(VERY SHORT ANSWER QUESTIONS)
  1. How is free energy change of a cell reaction related to (i) its emf (i...

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  2. Is free enegy change of a cell reaction an intensive property or exten...

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  3. What is overvoltage?

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  4. Write the product obtained at anode on electrolysis of concentrated su...

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  5. Name the electrolyte used in (i) dry cell (ii) mercury cell.

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  6. What is a primary cell? Give an example.

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  7. Give an example of a secondary cell.

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  8. Write the name of a cell used in small watches.

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  9. Which cells were used in the Apollo space program? What was the produc...

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  10. Define fuel cell?

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  11. How does H(2)-O(2) fuel cell operate?

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  12. State two advantages of H(2)-O(2) fuel cell over ordinary cell.

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  13. Write the name of the electrolyte used in fuel cell.

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  14. What is the overall electrochemical reaction taking place in rusting?

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  15. Out of zinc and tin which one protects iron better even after cracks a...

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  16. Define corrosion. What is the chemical formula of rust ?

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  17. Why Cr is used for coating Fe ?

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  18. What would happen if the protective tin coating over an iron bucket i...

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  19. Which metals can be used in the cathodic protection of Fe against rust...

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  20. Rusting of Fe is quicker in saline water than in ordinary water.

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