Home
Class 12
CHEMISTRY
Why E^(@) value of Mn, Ni and Zn are mor...

Why `E^(@)` value of `Mn, Ni` and `Zn` are more negative than expected ?

Text Solution

Verified by Experts

The statement also implies that why these transition metal are stronger reducing agents than expected. This is related to the stabilities of the divalent cations which are formed by the loss of electrons. The extra-stabilities of `Mn^(2+)` and `Zn^(2+)` ions is due to the presence of five half filled `(3d^(5))` and fully filled orbitals `(3d^(10))`.
However, the extra stability of `Ni^(2+)` ion is because of its high negative enthalpy of hydration because of the small ionic size.
Promotional Banner

Topper's Solved these Questions

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Long answer type Question|8 Videos

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Additional Important Question|28 Videos

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise NCERT Exercise|36 Videos

  • CYANIDES, ISOCYANIDES, NITROCOMPOUNDS AND AMINES

    DINESH PUBLICATION|Exercise Unit test - 8|20 Videos

  • ELECTROCHEMISTRY

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

Similar Questions

Explore conceptually related problems

Why E^(-) values for Mn, Ni and Zn are more negative than expected?

Assertion : E^@ value of Mn^(3+) | Mn^(2+) is more positive than for Cr^(3+)| Cr^(2+) . Reason Cr^(3+) is more stable than Cr^(2+) but Mn^(3+) is less stable than Mn^(2+) .

Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.

Would you expect the second electron gain enthalpy of S as positive, more negative or less negative than the first? Justify your answer.

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Short Answer type questions.
  1. Why does not copper liberate hydrogen from acids. ?

    Text Solution

    |

  2. Why E^(@) value of Mn, Ni and Zn are more negative than expected ?

    Text Solution

    |

  3. Why is first ionisation enthalpy of Cr lower than that of Zn ?

    Text Solution

    |

  4. Transition elements show high melting points. Why?

    Text Solution

    |

  5. Out of Cu(2)Cl(2), which is more stable and why ?

    Text Solution

    |

  6. When a brown compound of manganese [A] is treated with HCl, it gives a...

    Text Solution

    |

  7. When Cu^(2+) ion is treated with KI, a white precipitate is formed. Ex...

    Text Solution

    |

  8. Although flurorine is more electronegative than oxygen, but the abilit...

    Text Solution

    |

  9. Although Cr^(3+) and Co^(2+) ions have same number of unpaired electro...

    Text Solution

    |

  10. Ionisation enthalpies of Ce, Pr and Nd are higher than those of Th, Pa...

    Text Solution

    |

  11. Although Zr belongs to 4d and Hf belongs to 5d transition series, but...

    Text Solution

    |

  12. Although +3 oxidation stae is thje characteristic oxidation state of ...

    Text Solution

    |

  13. Explain why does colour of KMnO(4) disappear when oxalic acids is adde...

    Text Solution

    |

  14. When orange solution containing Cr(2)O(7)^(2-) ion is treated with an ...

    Text Solution

    |

  15. A solution of KMnO(4) on reduction yields either a colourless solution...

    Text Solution

    |

  16. The second and third rows of transition elements resemble each other ...

    Text Solution

    |

  17. E^(@) of Cu is +0.34 V while that of Zn is -0.736 V. Explain.

    Text Solution

    |

  18. The halides of transition elements become more covalent with increasin...

    Text Solution

    |

  19. While filling up electron in the atomic orbitals, 4s orbital is filled...

    Text Solution

    |

  20. Reactivity of transition element decreases almost regularly from Sc t...

    Text Solution

    |