Home
Class 12
CHEMISTRY
Why first ionisation enthalpy of Cr is l...

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

Text Solution

Verified by Experts

Ionisation enthalpy of Cr is less than that of Zn because Cr has stable `d^(5)` configuration. In case of zinc, electron comes out from completely filled 4s-orbital. So, removal of electron from zinc requires more energy as compared to the chromium.
Promotional Banner

Topper's Solved these Questions

  • D AND F-BLOCK ELEMENTS

    NCERT EXEMPLAR ENGLISH|Exercise Short Answer Type Question|20 Videos

  • COORDINATION COMPOUNDS

    NCERT EXEMPLAR ENGLISH|Exercise Long Answer Type Question|5 Videos

  • ELECTROCHEMISTRY

    NCERT EXEMPLAR ENGLISH|Exercise All Questions|67 Videos

Similar Questions

Explore conceptually related problems

How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?

How would you explain the fact that the first ionisation enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium?

Assertion: The first ionisation enthalpy of aluminium is lower than that of magnesium. Reason : Ionic radius of aluminium is smaller than that of magnesium.

Why is the ionisation enthalpy of hydrogen higher than that of sodium ?

The first ionisation potential of Al is smaller than that of Mg because:

How would you explain the fact that the first ionization enthalpy of Lithium is lesser than that of Beryllium but its second ionization enthalpy is greater than that of Beryllium?

Assertion: The first ionisation energy of aluminium is lower than that of magnesium. Reason: The ionic radius of aluminium is smaller than that of magnesium.

Why is the ionisation enthalpy of magnesium higher than that of potassium ?

Assertion: The first ionisation energy of Be is greater than that of B . Reason: 2p-orbital is lower in energy than 2s-orbital.

Assertion: The first ionisation energy of Be is greater than that of B . Reason: 2p-orbital is lower in energy than 2s-orbital.

NCERT EXEMPLAR ENGLISH-D AND F-BLOCK ELEMENTS-Short Answer Type Question
  1. Why does copper not replace hydrogen from acids?

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  4. Transition elements show high melting points. Why?

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  7. When a brown compound of manganese (A) is treated with HCl it gives a ...

    Text Solution

    |

  8. Although fluorine is more electronegative than oxygen, but the ability...

    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 Th, Pa and U. W...

    Text Solution

    |

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

    Text Solution

    |

  12. Cerium shows oxidation state of +4 because

    Text Solution

    |

  13. Explain why does colour of KMnO(4) disappear when oxalic acid is added...

    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 m...

    Text Solution

    |

  17. E^(Theta) of Cu is +0.34V while that of Zn is -0.76 V. Explain.

    Text Solution

    |

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

    Text Solution

    |

  19. While filling up of electrons in the atomic orbitals, the 4s orbital i...

    Text Solution

    |

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

    Text Solution

    |