The appearance of colour in solid alkali meta | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The appearance of colour in solid alkali metal halides is generally due to $F$-centres (Farbe centres).These are anionic vacancies occupied by unp

Vedclass · Accepted Answer

$F$-centres

Vedclass · Answer

(D) The appearance of colour in solid alkali metal halides is generally due to $F$-centres (Farbe centres).These are anionic vacancies occupied by unpaired electrons.When white light falls on these crystals,the electrons absorb energy from the visible region to get excited,which results in the crystal exhibiting a complementary colour.For example,$NaCl$ with $F$-centres appears yellow,$KCl$ appears magenta,and $KBr$ appears blue.

The appearance of colour in solid alkali metal halides is generally due to

Similar Questions

In a solid lattice,the cation has left a lattice site and is located at an interstitial position. The lattice defect is:

Which among the following solids shows Frenkel defect?

Which of the following statements is $NOT$ true about Schottky defect?

The formula of a metal oxide is $M_{0.96} O_1$. The fractions of metal that exist as $M^{3+}$ and $M^{2+}$ ions in that oxide are respectively

Assertion : Due to Frenkel defect,there is no effect on the density of the crystalline solid.
Reason : In Frenkel defect,no cation or anion leaves the crystal.

Vedclass Test Series

Exam Paper Generator

Online Exam Module