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

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

A

`E_(2) gt E_(3) gt E_(1)`

B

`E_(3) gt E_(2) gt E_(1)`

C

`E_(1) gt E_(2) gt E_(3)`

D

`E_(1) gt E_(3) gt E_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_("cell")=E_("cell")^(@)-(2.303RT)/(nF) log. ([Zn^(2+)])/([Cu^(2+)])`
`E_(1)=E_("cell")^(@)-(2.303RT)/(nF) log. (1)/(0.1)`
`=E_("cell")^(@)-(2.303RT)/(nF)log 10`
`=E_("cell")^(@)-(2.303RT)/(nF)" " (log 10=1)`
`E_(2)=E_("cell")^(@)-(2.303RT)/(nF) log 1`
`=E_("cell")^(@)" " (log1=0)`
`E_(3)=E_("cell")^(@)-(2.303RT)/(nF) log. (0.1)/(1)`
`=E_("cell")^(@)-(2.303RT)/(nF) log. (1)/(10)`
`=E_("cell")^(@)+(2.303RT)/(nF)`
`:.E_(3) gt E_(2) gt E_(1)`
Promotional Banner

Topper's Solved these Questions

  • ELECTROCHEMISTRY

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level-III) (Questions from AIEEE/JEE Examinations)|10 Videos

  • COORDINATION COMPOUNDS

    MODERN PUBLICATION|Exercise Recent Examination Questions|21 Videos

  • ENVIROMENTAL POLLUTION

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTIOS|2 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)) Which one of the following is true?

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

In the case of Daniell cell, Zn"|"Zn^(2+)"||"Cu^(2+)"|"Cu Which is not true ?

The e.m.f. of the cell at 25^(@)C Cu"|"Cu^(2+)(0.01M)"||"Ag^(+)(0.1M)"|"Ag is [E^(@)(Cu^(2+)"|"Cu)=0.34V, E^(@)(Ag^(+)"|"Ag)=0.80V]

The emf of a galvanic cell constituted with the electrodes Zn^(2+)"|"Zn(-0.76V) and Fe^(2+)"|"Fe(-0.41V) is :

Calculate EMF of the cell represents below Zn//Zn^(2+)(C=0.1M)||Cu^(2+)(C=1M)//Cu" at "25^(@)C Given E_(Cu)^(0)=0.34E_(Zn)^(0)=0.76v

The emf of a galvanic cell constituded with the electrodes Zn^(2+)//Zn (-0.76V) and Fe^(2+)//Fe (-0.41V) is

MODERN PUBLICATION-ELECTROCHEMISTRY-Recent Examination Questions
  1. In the electrolysis of acidulated water, it is desired to obtain 1.12 ...

    Text Solution

    |

  2. The one which decreases with dilution is

    Text Solution

    |

  3. The standard electrode potentials E^(@) for the half cell reactions ar...

    Text Solution

    |

  4. 9.65C of electric current is passed through fused anhydrous magnesium ...

    Text Solution

    |

  5. The standard emf of galvanic cell involving 3 moles of electrons in it...

    Text Solution

    |

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

    Text Solution

    |

  7. The approximate time duration in hours to electroplate 30 g of calcium...

    Text Solution

    |

  8. Which one of the following has a potential more than zero ?

    Text Solution

    |

  9. The emf of a galvanic cell constituted with the electrodes Zn^(2+)"|"Z...

    Text Solution

    |

  10. Conductivity of a saturated solution of a sparingly soluble salt AB at...

    Text Solution

    |

  11. For Cr2O7^(2-) + 14 H^(+) + 6e^(-) to 2Cr^(+3) + 7H2O, E^(@) = 1.33 V ...

    Text Solution

    |

  12. In H2-O2 fuel cell the reaction occurring at cathode is

    Text Solution

    |

  13. How many coulombs of electricity are required for the oxidation of one...

    Text Solution

    |

  14. The standard electrode potential for Daniel cell is 1.1 volt. What is ...

    Text Solution

    |

  15. The cathode reaction in the dry cell will be :

    Text Solution

    |

  16. Lambda(m)^(@) for NH(4)Cl, NaOH and NaCl are 130, 248 and 126.5 "ohm"^...

    Text Solution

    |

  17. Strongest reducing agent among the following is : (i) Na^(+)+e^(-) ...

    Text Solution

    |