Home
Class 12
CHEMISTRY
ZnO is white cold and yellow when heated...

`ZnO` is white cold and yellow when heated, it is due to the development of

Text Solution

Verified by Experts

`Zn^(2+)` ion (ZnO) has `3d^(10)` electronic configuration with all the electrons paired. Therefore, ZnO is white. The yellow colour of Zno is due to non-stoichiometric defect leading to extra cation at the interstital sites.
Promotional Banner

Topper's Solved these Questions

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Question From Board Examination|85 Videos

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Higher order Thinking skill (HOTS)|11 Videos

  • D-AND -F BLOCK ELEMENTS

    DINESH PUBLICATION|Exercise Long answer type Question|8 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

In an ideal crystal, the entropy of the constituents at absolute zero temperature (0K) is zero. However, the crystals generally suffer from certain defects also called imperfections They may be both electronic and atomic in nature. The atomic imperfections may be stoichiometric (Schottky and Frenkel defects) or non-stoichiometric (metal excees and metal deficiency defects). In addition to these, there are impurity defects which are caused by the addition of certain impurities of metals and this is known as dopping. The dopping leads to semi conductors which may be either n-type or p-type in nature. Zinc oxide (ZnO) is white when cold and yellow when hot. It is due to the development of :

Assertion : ZnO becomes yellow when it is beated Reason: NaCI becomes yellow when heater in the presence of Na vapours due to anion vacancy

ZnO shows yellow colour on heating due to

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Additional Important Question
  1. Transition metals of 3d-series donot react readily with dilute acids t...

    Text Solution

    |

  2. Which of the following element form interstitial compounds?

    Text Solution

    |

  3. ZnO is white cold and yellow when heated, it is due to the development...

    Text Solution

    |

  4. Calculate equivalent weight of Cu in CuO and Cu(2)O. At.wt. of Cu=63.6...

    Text Solution

    |

  5. Out of Co^(2+) and Ni^(2+) ions, which has lower magnetic moment ?

    Text Solution

    |

  6. Copper (I) is diamagnetic while copper (II) is paramagnetic . Explain...

    Text Solution

    |

  7. Zn^(2+) salt are white while Cu^(2+) salts are blue. Assign reason.

    Text Solution

    |

  8. Out of Fe^(2+) and Fe^(3+) ions, which is more stable ?

    Text Solution

    |

  9. Anhydrous ferric chloride is prepared by:

    Text Solution

    |

  10. On the basis of the standard electroe potential values stated for acid...

    Text Solution

    |

  11. Whys is chemistry of all lanthaoids identical ?

    Text Solution

    |

  12. The element scandium (Z=21) does not exhibit variable oxidation state ...

    Text Solution

    |

  13. Why is the E^(Theta) value for the Mn^(3+)//Mn^(2+) couple much postiv...

    Text Solution

    |

  14. With 3d^(4) configuration, Cr^(2+) acts as a reducing agent but Mn^(3+...

    Text Solution

    |

  15. One among the lanthanoides, Ce(III), can be easily oxidized to Ce(IV) ...

    Text Solution

    |

  16. Copper (I) is diamagnetic while copper (II) is paramagnetic . Explain...

    Text Solution

    |

  17. Why do chromium group elements have the highest melting point in their...

    Text Solution

    |

  18. Why do transition metals form coloured complexes ?

    Text Solution

    |

  19. Among transition metals, the highest oxidation state is exhibited in o...

    Text Solution

    |

  20. Ce^(4+) is used as an oxidising agent in volumetric analysis. Why ?

    Text Solution

    |