Home
Class 12
CHEMISTRY
If E(1),E(2) and E(3) are the emf values...

If `E_(1),E_(2)` and `E_(3)` are the emf values of the three galvanic cells respectivley
(i)`Zn|Zn^(2+)(1M)||Cu^(2+)(0.1M)|Cu`
(ii) `Zn|Zn^(2+)(1M)||Cu^(2+)(1M)|Cu`
(iii) `Zn|Zn^(2+)(0.1)||Cu^(2+)(1M)|Cu`.
Which one of the following is true.

A

`E_(2)gtE_(3)gtE_(1)`

B

`E_(3)gtE_(2)gtE_(1)`

C

`E_(1)gtE_(2)gtE_(2)`

D

`E_(1)gtE_(3)gtE_(2)`.

Text Solution

Verified by Experts

The correct Answer is:
C
`Zn+Cu^(2+)rarrZn^(2+)+Cu`
`E_("cell")=E_("cell")^(@)-(0.059)/(2)"log"(|Zn^(2+)|)/(|Cu^(2+)|)`
The higher the value of `|Zn^(2+)|//|Cu^(2+)|`, lower is the value of cell, `|Zn^(2+)|//|Cu^(2+)|` is=
`(1)/(0.1)=10` for (ii) `=(1)/(1)=1` or (iii) `=(0.1)/(1)=0.1`
`therefore E_(3)gtE_(2)gtE_(1)`.
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    DINESH PUBLICATION|Exercise SELECTED STRAIGHT OBJECTIVE|67 Videos

  • ELECTROCHEMISTRY

    DINESH PUBLICATION|Exercise MATCH-MATRIX|7 Videos

  • ELECTROCHEMISTRY

    DINESH PUBLICATION|Exercise ADDITIONAL NUMERICAL PROBLEMS FOR PRACTICE|12 Videos

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise BRAIN STORMING MULTIPLE CHOICE QUESTIONS (MCQS)|13 Videos

  • ETHERS

    DINESH PUBLICATION|Exercise (MCQs)|8 Videos

Similar Questions

Explore conceptually related problems

E_(1) , E_(2) and E_(3) are the emfs of the following three galvanic cells respectively I. Zn((s)) | Zn^(2+) (0.1M) | | CU^(2+) (1M) | Cu((s)) II. Zn((s)) ZN^(2+) (1M) || Cu^(2+)(1M) | Cu(s) III. Zn(s) | Zn^(2+) (1M) || CU^(2+)(0.1M)CU(s)

The emf of the following three galvanic cells : 1. Zn//Zn^(2+) ( 1M) || Cu^(2+) (1 M) //Cu 2. Zn//ZN^(2+ ) (1 M)|| Cu^(2+) //cu 3. Zn//Zn^(2+) (1 M) || Cu^(2+) (0.1 M) Cu are repersented by E_1, E_2, E_3 which of the following statement is true ?

DINESH PUBLICATION-ELECTROCHEMISTRY-REVISION QUESTIONS FROM COMPETITIVE EXAMS
  1. In the electrolysis of which solution OH^(-) ions are discharged in p...

    Text Solution

    |

  2. The compound exhibiting maximum conductance in a fused state is

    Text Solution

    |

  3. If the half cell reactions are given as (i) Fe^(2+)(aq)+2e^(-)rarrFe...

    Text Solution

    |

  4. The logarithm of the equilibrium constant of the cell reaction corresp...

    Text Solution

    |

  5. A current is passed through two cells connected in series. The first c...

    Text Solution

    |

  6. The limiting molar conductivities of HCl, CH(3)COONa and NaCl are resp...

    Text Solution

    |

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

    Text Solution

    |

  8. A solution contains Fe^(2+), Fe^(3+) and T^(-) ions. This solution was...

    Text Solution

    |

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

    Text Solution

    |

  10. If E(1),E(2) and E(3) are the emf values of the three galvanic cells ...

    Text Solution

    |

  11. Consider the following cell reaction 2Fe(s)+O(2)(g)+4H^(+)(aq)rarr2F...

    Text Solution

    |

  12. If the E^(@) for a given reaction has a negative value, then which of ...

    Text Solution

    |

  13. Which pair of electrolytes could not be distinguished by the products ...

    Text Solution

    |

  14. The electrode potentials for Cu^(2+)+e^(-)toCu^(+) and Cu^(+)e^(-)...

    Text Solution

    |

  15. AgNO(3)(aq) was added to an aqueous KCl soltuion gradually and conduct...

    Text Solution

    |

  16. Standard reduction potentails of the half reactions are given below: ...

    Text Solution

    |

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

    Text Solution

    |

  18. Given E("Cr(2)O(7)^(2-)//Cr^(3+))^(@)=1.33V,E(MnO(4)^(-)//Mn^(2+))^(@)...

    Text Solution

    |

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

    Text Solution

    |

  20. A hydrogen gas electrode is made by dipping platinum wire in a solutio...

    Text Solution

    |