Home
Class 12
CHEMISTRY
EMF of an H(2)-O(2) fuel cell...

EMF of an `H_(2)-O_(2)` fuel cell

A

Is indepenent of partial pressures of `H_(2)` and `O_(2)`

B

Decreases on increasing `P_(H_(2))` and `P_(O_(2))`

C

Increases on increasing `P_(H_(2))` and `P_(O_(2))`

D

Varies with the concentration of `OH^(-)` ions in the cathodic and anodic compartments.

Text Solution

Verified by Experts

The correct Answer is:
C
`E_(cell)=E_(cell)^(@)+(0.059)/(2)logp_(H_(2)).p_(o_(2))^(1//2)`
Promotional Banner

Topper's Solved these Questions

  • ELECTRO CHEMISTRY

    NARAYNA|Exercise AIEEE & JEE MAIN PREVIOUS|38 Videos

  • ELECTRO CHEMISTRY

    NARAYNA|Exercise NCERT BASED QUESTIONS|8 Videos

  • ELECTRO CHEMISTRY

    NARAYNA|Exercise LEVEL-II(C.W)|61 Videos

  • 15TH GROUP ELEMENTS

    NARAYNA|Exercise EXERCISE - 4 (NCERT EXEMPLERS/HOTs)|27 Videos

Similar Questions

Explore conceptually related problems

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

What are fuel cells ? Explain the electrode reactions involved in the working of 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 :

(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.

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 A fuel cell is I. A voltaic cell in which continuous supply of fuels are sent at anode to perform oxidation. II. A voltaci cell in which fuels such as :CH_(4),H_(2), and CO are used up at anode. III. One which involves the reaction of H_(2)-O_(2) fuel cell such as : Anode :2H_(2)O+4overset(c-)(O)H rarr 4H_(2)O(l)+4e^(c-) Cathode : O_(2)+2H_(2)O(l) =4e^(-) rarr 4overset(c-)(O)H IV. The efficiency of H_(2)-O_(20 fuel cell is 70 to 75%

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

NARAYNA- ELECTRO CHEMISTRY-LEVEL-III
  1. The standard reduction potentials of Cu^(2+)//Cu and Cu^(2+)//Cu^(+) a...

    Text Solution

    |

  2. Given the cell reactions MX((s))+e^(-)rarrM((s))+X((aq))^(-),E^(@)=0...

    Text Solution

    |

  3. EMF of an H(2)-O(2) fuel cell

    Text Solution

    |

  4. The EMF of the cell Pt,Cl(2(g))(P(1)atm)|Cl((aq))^(-)(1M)|Cl(2(g)))P...

    Text Solution

    |

  5. Standard electrode potentials are Fe^(2+)//Fe, E^(@) = -0.44 V Fe^...

    Text Solution

    |

  6. At any instant during the reaction Zn+Cu^(++)rarrZn^(++)+Cu Occurring ...

    Text Solution

    |

  7. Zn+Cu^(2+)(aq)hArrCu+Zn^(2+)(aq). Reaction quotient is Q=([Zn^(2+)])...

    Text Solution

    |

  8. For the half cell At pH = 3 electrode potential is

    Text Solution

    |

  9. Find the equilibrium constant at 298K for the reaction, Cu^(2+)(aq) ...

    Text Solution

    |

  10. The standard reduction potential for Cu^(2+)|Cu is +0.34V. Calculate t...

    Text Solution

    |

  11. During discharging of lead-storage acid battery following reaction tak...

    Text Solution

    |

  12. Zn|Zn^(2+)(c(1)) || Zn^(2+)(c(2))|Zn. For this cell DeltaG is negative...

    Text Solution

    |

  13. The oxidation potential of hydrogen electrode H(2)//H(2)O^(+) (aq) wil...

    Text Solution

    |

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

    Text Solution

    |

  15. A galvanic cell is compsed of two hydrogen electrodes, one of which is...

    Text Solution

    |

  16. The following facts have been observed: 2X^(-)+Y(2)rarr2Y^(-)+X(2) ...

    Text Solution

    |

  17. Two weak acid solutions HA(1) and HA(2) with the same concentration an...

    Text Solution

    |

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

    Text Solution

    |

  19. What will be the emf for the given cell ? Pt|H(2)(g,P(1))|H^(+)(aq)|...

    Text Solution

    |

  20. The negative Zn pole of Daniell cell, sending a constant current throu...

    Text Solution

    |