Home
Class 12
CHEMISTRY
The cell reaction of a cell is Mg(s) + C...

The cell reaction of a cell is
`Mg(s) + Cu^(2+)(aq) to Cu(s) + Mg^(2+)(aq)`
If the standard reduction potentials of magensium and copper are -0.33 and +2.38 V respectively, the emf of the cell is

A

+ 2.03V

B

-2.03V

C

+ 2.71V

D

-2.71V

Text Solution

Verified by Experts

The correct Answer is:
C
`E_((Mg^(2+))//(Mg))^@ = 0.33V and E_((Cu^(2+))//(Cu))^@=+ 2.38V`.
`E_(cell)^@= E_(cathode)^@-E_(anode)^@= E_((Cu^(2+))//(Cu))^@ - E_((Mg^(2+))//(Mg))^@`
`E_(cell)^@= 2.38 - (- 0.33) = + 2.71 V`.
Promotional Banner

Topper's Solved these Questions

  • EAMCET-2019 (TS) SHIFT-1

    SIA PUBLICATION|Exercise CHEMISTRY|30 Videos

  • ENVIRONMENTAL CHEMISTRY

    SIA PUBLICATION|Exercise PROBLEM|16 Videos

Similar Questions

Explore conceptually related problems

For the cell reaction, Mg_((s))+Cu_((aq))^(2+) rarr Cu_((s)) +g^(2+)(aq.) the standard reduction potentials of Mg and Cu are -2.37 V and 0.34 V respectively. The e.m.f. of the cell is

The cell reaction of the galvanic cell, Cu(s) // Cu^(2+)(aq) // Hg^(2+) (aq) // Hg (l) is

The standard reduction potentials of Ag, Cu, Co and Zn are 0.799, 0.337,-0.277 and 0.762V respectively. Which of the following cells will have maximum cell e.m.f.?

The potential of the cell Cu, Cu^(2+) (0.1M)"//"HCl (xM), Cl_(2), Pt is 1.07 V. If the standard potential of copper and chlorine electrodes are 10.34 V and 1.36 V, calculate the concentration of HCI.

Consider the following four electrode : A = Cu^(2+) (0.0001 M)// Cu(S) B= Cu^(2+) (0.1M)//Cu(s) C = Cu^(2+) (0.01 M )//Cu(s) D) = Cu^(2+) (0.001 M )// Cu(s) If the standard reduction potential of Cu^(+2)// Cu is + 0.34 V , the reduction potential ( in volts ) of the above electrodes follow the order

2Cu_(2)O(s)+Cu_(2)(s) rarr 6Cu(s) +SO_(2)(g) the oxidant and reductant respectively in the above reaction are

At what concentration of copper sulphate solution, the potential of Cu^(2+) , Cu becomes zero? The standard reduction potential of Cu^(2+) , Cu is 0.34 V.

SIA PUBLICATION-ELECTROCHEMISTRY-M.C.Q.
  1. What is the approximate quantity of electricity (in coulomb) required ...

    Text Solution

    |

  2. The units of electrochemical equilvalent are

    Text Solution

    |

  3. The cell reaction of a cell is Mg(s) + Cu^(2+)(aq) to Cu(s) + Mg^(2+)(...

    Text Solution

    |

  4. Which one of the following metals will not reduce H(2)O?

    Text Solution

    |

  5. In the electrochemical cell H(2)(g) 1atm | 1H^(+)(lm) || Cu^(2+) (IM)...

    Text Solution

    |

  6. On passing a current through a KCl solution, 19.5g of potassium is dep...

    Text Solution

    |

  7. The reaction taking place at the anode, when an aqueous solution of Cu...

    Text Solution

    |

  8. The standard reduction potentials at 298 K for the following half cell...

    Text Solution

    |

  9. When Zn metal is added to CuSO(4) solution, Cu is precipitated, it is ...

    Text Solution

    |

  10. Which of the following alkali metals has the greatest tendency for the...

    Text Solution

    |

  11. When a copper wire is dipped in aqueous AgNO(3) solution, the solution...

    Text Solution

    |

  12. How many grams of copper would be deposited, if 3.00 A of current is p...

    Text Solution

    |

  13. The metal that has the highest electrical conductivity is

    Text Solution

    |

  14. How many grams of copper will be deposited from a solution of CuSO(4) ...

    Text Solution

    |

  15. The single electrode reactions, Cd(s) to Cd^(2+) (0.1) + 2e^(-) , E ^...

    Text Solution

    |

  16. When dilute H(2)SO(4) is electrolysed at room temperature between plat...

    Text Solution

    |

  17. When 9.65 C of electricity is passed through a solution of AgNO(3) (at...

    Text Solution

    |

  18. Three faradays of electricity was passed through an aqueous solution o...

    Text Solution

    |

  19. For a reversible reaction A leftrightarrow B, which one of the followi...

    Text Solution

    |

  20. The rate constant of a first order reaction at 27^@C is 10^(-3)mi n^(-...

    Text Solution

    |