Home
Class 12
CHEMISTRY
A button cell used in watched funcations...

A button cell used in watched funcations as follwing
`Zn(s)+Ag_(2)O(s)+H_(2)O(l)hArr2Ag(s)+Zn^(2+)(aq.)+2OH^(-)(aq)`
If half cell potentials are
`Zn^(2+)(aq.)+2e^(-) rarr Zn(s), E^(@) = -0.76 V`
`Ag_(2)O(s)+H_(2)O(l)+2e^(-) rarr 2Ag(s)+2OH^(-)(aq.),, E^(@) = 0.34V`
The cell potential will be

A

1.10V

B

0.42V

C

0.84V

D

1.34V

Text Solution

Verified by Experts

The correct Answer is:
A
(a) Anode is always the site of oxidation thus, anode half - cell is
`Zn^(2+)(aq)+2e^(-) to Zn(s)," " E^(@)=-0.76 V`
Cathode half-cell is
`Ag_(2)O(s)+H_(2)O(l)+2e^(-) to 2Ag(s)+2OH^(-)(aq), E^(@)=0.34 V`
`E_(cell)^(@)=E_("cathode")^(@)-E_("anode")^(@)`
`=0.34-(-0.76)=+1.10V`
Promotional Banner

Topper's Solved these Questions

  • COORDINATION COMPOUNDS

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise EXERCISE|66 Videos

  • HYDROGEN, ITS COMPOUNDS AND S-BLOCK ELEMENTS

    NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)|Exercise EXERCISE|35 Videos

Similar Questions

Explore conceptually related problems

A button cell used in watches functions as following Zn(s) + Ag _2 O(s) + H_2 O(l) 2 A g(s) + Zn^(2+) (aq) = 2 OH^- (aq) If half cell potentials are Zn^(2+) (aq) +2e^- rarr Zn (s) , E^@ =- 0. 76 V Af_2 O(s) +H_2 O (l) +2e^- rarr 2Ag(s) + 2OH^- (aq) , E^@ =0. 34 V . The cell potential will be .

In the button cells widely used in watches and other devices the following reaction takes place: Zn(s) + Ag_(2)O(s) + H_(2)O (l) to Zn^(2+) (aq) + 2Ag(s) + 2OH^(-)(aq) Determine DeltaG^(@) and E^(@) for the reaction Zn(s) to Zn^(2+) + 2e^(-) , E^(@) = 0.76 V Ag_(2)O + H_(2)O + 2e^(-) to 2Ag + 2OH^(-) E^(@) = +0.34 V

Consider Delta G^(@) for the following cell reaction : Zn (s) + Ag_(2)O(s)+H_(2)O(l) hArr Zn^(2+)(aq)+2Ag(s)+2OH^(-)(aq) E_(Ag^(+)//Ag)^(@) = +0.80 and E_(Zn^(2+)//Zn)^(@) = - 0.76 V

NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-ELECTROCHEMISTRY-Exercise
  1. A hydrogen gas electrode is made by dipping platinum wire in a solutio...

    Text Solution

    |

  2. At 25^(@)C molar conductance of 0.1 molar aqueous solution of ammonium...

    Text Solution

    |

  3. A button cell used in watched funcations as follwing Zn(s)+Ag(2)O(s)...

    Text Solution

    |

  4. Limiting molar conductivity of NH(4)OH [i.e., Lambda(m)^(@)(NH(4)OH)] ...

    Text Solution

    |

  5. Standard electrode potential of three metal X, Y and Z are -1.2 V, +0....

    Text Solution

    |

  6. The electrode pptenticals for Cu^(2+) (aq) +e^(-) rarr Cu^+ (aq) ...

    Text Solution

    |

  7. Standard electrode potential for Sn^(4+)//Sn^(2+) couple is 0.15 V and...

    Text Solution

    |

  8. For the reduction of silver ions with copper metal, the standard cell ...

    Text Solution

    |

  9. An increase in equivalent conductance of a strong electrolyte with dil...

    Text Solution

    |

  10. Given: (i) Cu^(2+)+2e^(-) rarr Cu, E^(@) = 0.337 V (ii) Cu^(2+)+e^...

    Text Solution

    |

  11. The equivalent conductance of M//32 solution of a weak monobasic acid ...

    Text Solution

    |

  12. Al(2)O(3) is reduced by electrolysis at low potentials and high curren...

    Text Solution

    |

  13. Standard free energies of formation (I kJ //mol ) at 298 K are -237 ....

    Text Solution

    |

  14. Kohlrausch's law states that:

    Text Solution

    |

  15. On the basis of the following E^(@) values, the stongest oxidizing age...

    Text Solution

    |

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

    Text Solution

    |

  17. Calculate the equilibrium constant of the reaction : Cu(s)+2Ag(aq) h...

    Text Solution

    |

  18. If E(Fe^(2+))^(@)//Fe = -0.441 V and E(Fe^(3+))^(@)//Fe^(2+) = 0.771...

    Text Solution

    |

  19. A hypothetical elecrochemical cell is shown below: A^(ɵ)|A^(+)(xM)||...

    Text Solution

    |

  20. 4.5 g of aluminium (at mass 27 u) is deposited at cathode from Al^(3+)...

    Text Solution

    |