Home
Class 12
CHEMISTRY
What are F-centres? What colour is impar...

What are F-centres? What colour is imparted to NaCl, KCl and LiCl crystals on exposure to sun light.

Text Solution

Verified by Experts

In metal excess defect solids, electrons are trapped in anion vacancies. These points are called F-centres.
NaCl imparts - Golden yellow colour.
KCl imparts - Violet colour
LaCi imparts - Pink colour.
Promotional Banner

Topper's Solved these Questions

  • THE SOLID STATE

    SUBHASH PUBLICATION|Exercise PROBLEM SECTION|16 Videos

  • THE 'P'-BLOCK ELEMENTS

    SUBHASH PUBLICATION|Exercise EXERCISE|86 Videos

Similar Questions

Explore conceptually related problems

What is light ?

What are coherent sources of light?

What are interstitial in a crystal ?

The presence of F-centres in a crystal makes it

What is the colour of live wire ?

What is the colour imparts when calcium, Barium and strontium undergoes glame test?

What is the contribution of a corner particle to a unit cell in a cubic crystal lattice ?

On what factor does the colour of the scattered light depend ?

What is normal shift of light?

SUBHASH PUBLICATION-THE SOLID STATE -PROBLEM SECTION
  1. What are F-centres? What colour is imparted to NaCl, KCl and LiCl crys...

    Text Solution

    |

  2. Silver crystallizes in CCP lattice. The edge length of its unit cell i...

    Text Solution

    |

  3. An element having atomic mass 63.1 g/mol has face centered cubic unit ...

    Text Solution

    |

  4. An element having atomic mass 107.9 g mol^(-1) has FCC unit cell. The ...

    Text Solution

    |

  5. An element occurs in BCC structure with cell edte of 288 pm. Find the ...

    Text Solution

    |

  6. A compound formed by the element A and B crystallizes in the cubic str...

    Text Solution

    |

  7. An element crystallizes in fcc lattice. If the edge length of the unit...

    Text Solution

    |

  8. An element occurs in BCC structure with cell edge of 288 pm. It is 7.2...

    Text Solution

    |

  9. The density of chromium metal is 7.2 g cm^(-3). If the unit cell is cu...

    Text Solution

    |

  10. The density of an cubic unit cell is 10.5 g cm^(-3). If the edge lengt...

    Text Solution

    |

  11. Niobiumcrystallizs in body centered strucure. If density is 8.55 g cm^...

    Text Solution

    |

  12. Aluminium crystallizes in FCC structure. Atomic radius of the metalics...

    Text Solution

    |

  13. Sodium metal crystallizes in body centred cubic lattice with the cell ...

    Text Solution

    |

  14. An element with edge length 7Å crystallizes in SC. Calculate radius of...

    Text Solution

    |

  15. A compound A(x)B(y) crystallizes in a FCC lattice in which A occupies ...

    Text Solution

    |

  16. How many tetrahedral voids and octahedral voids are possible if the nu...

    Text Solution

    |

  17. A compound is formed by two elements x and y. Atoms of the element y (...

    Text Solution

    |